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<div id="contentBody"><div class="title_container"><div class="page_title">Config</div></div><ul><li><a href="#NAME">NAME</a><li><a href="#SYNOPSIS">SYNOPSIS</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#EXAMPLE">EXAMPLE</a><li><a href="#WARNING">WARNING</a><li><a href="#GLOSSARY">GLOSSARY</a><ul><li><a href="#_">_</a><li><a href="#a">a</a><li><a href="#b">b</a><li><a href="#c">c</a><li><a href="#d">d</a><li><a href="#e">e</a><li><a href="#f">f</a><li><a href="#g">g</a><li><a href="#h">h</a><li><a href="#i">i</a><li><a href="#k">k</a><li><a href="#l">l</a><li><a href="#m">m</a><li><a href="#M">M</a><li><a href="#n">n</a><li><a href="#o">o</a><li><a href="#p">p</a><li><a href="#P">P</a><li><a href="#q">q</a><li><a href="#r">r</a><li><a href="#s">s</a><li><a href="#t">t</a><li><a href="#u">u</a><li><a href="#v">v</a><li><a href="#x">x</a><li><a href="#y">y</a><li><a href="#z">z</a></ul><li><a href="#NOTE">NOTE</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>Config - access Perl configuration information</p>
<a name="SYNOPSIS"></a><h1>SYNOPSIS</h1>
<pre class="verbatim"> <a class="l_k" href="functions/use.html">use</a> <span class="w">Config</span><span class="sc">;</span>
if <span class="s">(</span><span class="i">$Config</span>{<span class="w">usethreads</span>}<span class="s">)</span> <span class="s">{</span>
<a class="l_k" href="functions/print.html">print</a> <span class="q">"has thread support\n"</span>
<span class="s">}</span></pre>
<pre class="verbatim"> <a class="l_k" href="functions/use.html">use</a> <span class="w">Config</span> <span class="q">qw(myconfig config_sh config_vars config_re)</span><span class="sc">;</span></pre>
<pre class="verbatim"> <a class="l_k" href="functions/print.html">print</a> <span class="i">myconfig</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span></pre>
<pre class="verbatim"> <a class="l_k" href="functions/print.html">print</a> <span class="i">config_sh</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span></pre>
<pre class="verbatim"> <a class="l_k" href="functions/print.html">print</a> <span class="i">config_re</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span></pre>
<pre class="verbatim"> <span class="i">config_vars</span><span class="s">(</span><span class="q">qw(osname archname)</span><span class="s">)</span><span class="sc">;</span></pre>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>The Config module contains all the information that was available to
the <code class="inline"><span class="w">Configure</span></code>
program at Perl build time (over 900 values).</p>
<p>Shell variables from the <i>config.sh</i> file (written by Configure) are
stored in the readonly-variable <code class="inline"><span class="i">%Config</span></code>
, indexed by their names.</p>
<p>Values stored in config.sh as 'undef' are returned as undefined
values. The perl <code class="inline"><a class="l_k" href="functions/exists.html">exists</a></code> function can be used to check if a
named variable exists.</p>
<ul>
<li><a name="myconfig()"></a><b>myconfig()</b>
<p>Returns a textual summary of the major perl configuration values.
See also <code class="inline">-<span class="w">V</span></code>
in <a href="perlrun.html#Switches">"Switches" in perlrun</a>.</p>
</li>
<li><a name="config_sh()"></a><b>config_sh()</b>
<p>Returns the entire perl configuration information in the form of the
original config.sh shell variable assignment script.</p>
</li>
<li><a name="config_re(%24regex)"></a><b>config_re($regex)</b>
<p>Like config_sh() but returns, as a list, only the config entries who's
names match the $regex.</p>
</li>
<li><a name="config_vars(%40names)"></a><b>config_vars(@names)</b>
<p>Prints to STDOUT the values of the named configuration variable. Each is
printed on a separate line in the form:</p>
<pre class="verbatim"> <span class="w">name</span>=<span class="q">'value'</span><span class="sc">;</span></pre>
<p>Names which are unknown are output as <code class="inline"><span class="w">name</span>=<span class="q">'UNKNOWN'</span><span class="sc">;</span></code>
.
See also <code class="inline">-V:name</code> in <a href="perlrun.html#Switches">"Switches" in perlrun</a>.</p>
</li>
</ul>
<a name="EXAMPLE"></a><h1>EXAMPLE</h1>
<p>Here's a more sophisticated example of using %Config:</p>
<pre class="verbatim"> <a class="l_k" href="functions/use.html">use</a> <span class="w">Config</span><span class="sc">;</span>
<a class="l_k" href="functions/use.html">use</a> <span class="w">strict</span><span class="sc">;</span></pre>
<pre class="verbatim"> <a class="l_k" href="functions/my.html">my</a> <span class="i">%sig_num</span><span class="sc">;</span>
<a class="l_k" href="functions/my.html">my</a> <span class="i">@sig_name</span><span class="sc">;</span>
unless<span class="s">(</span><span class="i">$Config</span>{<span class="w">sig_name</span>} && <span class="i">$Config</span>{<span class="w">sig_num</span>}<span class="s">)</span> <span class="s">{</span>
<a class="l_k" href="functions/die.html">die</a> <span class="q">"No sigs?"</span><span class="sc">;</span>
<span class="s">}</span> else <span class="s">{</span>
<a class="l_k" href="functions/my.html">my</a> <span class="i">@names</span> = <a class="l_k" href="functions/split.html">split</a> <span class="q">' '</span><span class="cm">,</span> <span class="i">$Config</span>{<span class="w">sig_name</span>}<span class="sc">;</span>
<span class="i">@sig_num</span>{<span class="i">@names</span>} = <a class="l_k" href="functions/split.html">split</a> <span class="q">' '</span><span class="cm">,</span> <span class="i">$Config</span>{<span class="w">sig_num</span>}<span class="sc">;</span>
foreach <span class="s">(</span><span class="i">@names</span><span class="s">)</span> <span class="s">{</span>
<span class="i">$sig_name</span>[<span class="i">$sig_num</span>{<span class="i">$_</span>}] ||= <span class="i">$_</span><span class="sc">;</span>
<span class="s">}</span>
<span class="s">}</span></pre>
<pre class="verbatim"> <a class="l_k" href="functions/print.html">print</a> <span class="q">"signal #17 = $sig_name[17]\n"</span><span class="sc">;</span>
if <span class="s">(</span><span class="i">$sig_num</span>{<span class="w">ALRM</span>}<span class="s">)</span> <span class="s">{</span>
<a class="l_k" href="functions/print.html">print</a> <span class="q">"SIGALRM is $sig_num{ALRM}\n"</span><span class="sc">;</span>
<span class="s">}</span></pre>
<a name="WARNING"></a><h1>WARNING</h1>
<p>Because this information is not stored within the perl executable
itself it is possible (but unlikely) that the information does not
relate to the actual perl binary which is being used to access it.</p>
<p>The Config module is installed into the architecture and version
specific library directory ($Config{installarchlib}) and it checks the
perl version number when loaded.</p>
<p>The values stored in config.sh may be either single-quoted or
double-quoted. Double-quoted strings are handy for those cases where you
need to include escape sequences in the strings. To avoid runtime variable
interpolation, any <code class="inline"><span class="i">$</span></code>
and <code class="inline"><span class="i">@</span></code>
characters are replaced by <code class="inline">\<span class="i">$</span></code>
and
<code class="inline">\<span class="i">@</span></code>
, respectively. This isn't foolproof, of course, so don't embed <code class="inline">\<span class="i">$</span></code>
or <code class="inline">\<span class="i">@</span></code>
in double-quoted strings unless you're willing to deal with the
consequences. (The slashes will end up escaped and the <code class="inline"><span class="i">$</span></code>
or <code class="inline"><span class="i">@</span></code>
will
trigger variable interpolation)</p>
<a name="GLOSSARY"></a><h1>GLOSSARY</h1>
<p>Most <code class="inline"><span class="w">Config</span></code>
variables are determined by the <code class="inline"><span class="w">Configure</span></code>
script
on platforms supported by it (which is most UNIX platforms). Some
platforms have custom-made <code class="inline"><span class="w">Config</span></code>
variables, and may thus not have
some of the variables described below, or may have extraneous variables
specific to that particular port. See the port specific documentation
in such cases.</p>
<a name="_"></a><h2>_</h2>
<ul>
<li><a name="'_a'"></a><b><code class="inline"><span class="w">_a</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This variable defines the extension used for ordinary library files.
For unix, it is <i>.a</i>. The <i>.</i> is included. Other possible
values include <i>.lib</i>.</p>
</li>
<li><a name="'_exe'"></a><b><code class="inline"><span class="w">_exe</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This variable defines the extension used for executable files.
<code class="inline"><span class="w">DJGPP</span></code>
, Cygwin and <i>OS/2</i> use <i>.exe</i>. Stratus <code class="inline"><span class="w">VOS</span></code>
uses <i>.pm</i>.
On operating systems which do not require a specific extension
for executable files, this variable is empty.</p>
</li>
<li><a name="'_o'"></a><b><code class="inline"><span class="w">_o</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This variable defines the extension used for object files.
For unix, it is <i>.o</i>. The <i>.</i> is included. Other possible
values include <i>.obj</i>.</p>
</li>
</ul>
<a name="a"></a><h2>a</h2>
<ul>
<li><a name="'afs'"></a><b><code class="inline"><span class="w">afs</span></code>
</b>
<p>From <i>afs.U</i>:</p>
<p>This variable is set to <code class="inline"><span class="w">true</span></code>
if <code class="inline"><span class="w">AFS</span></code>
(Andrew File System) is used
on the system, <code class="inline"><span class="w">false</span></code>
otherwise. It is possible to override this
with a hint value or command line option, but you'd better know
what you are doing.</p>
</li>
<li><a name="'afsroot'"></a><b><code class="inline"><span class="w">afsroot</span></code>
</b>
<p>From <i>afs.U</i>:</p>
<p>This variable is by default set to <i>/afs</i>. In the unlikely case
this is not the correct root, it is possible to override this with
a hint value or command line option. This will be used in subsequent
tests for AFSness in the Perl configure and test process.</p>
</li>
<li><a name="'alignbytes'"></a><b><code class="inline"><span class="w">alignbytes</span></code>
</b>
<p>From <i>alignbytes.U</i>:</p>
<p>This variable holds the number of bytes required to align a
double-- or a long double when applicable. Usual values are
2, 4 and 8. The default is eight, for safety.</p>
</li>
<li><a name="'ansi2knr'"></a><b><code class="inline"><span class="w">ansi2knr</span></code>
</b>
<p>From <i>ansi2knr.U</i>:</p>
<p>This variable is set if the user needs to run ansi2knr.
Currently, this is not supported, so we just abort.</p>
</li>
<li><a name="'aphostname'"></a><b><code class="inline"><span class="w">aphostname</span></code>
</b>
<p>From <i>d_gethname.U</i>:</p>
<p>This variable contains the command which can be used to compute the
host name. The command is fully qualified by its absolute path, to make
it safe when used by a process with super-user privileges.</p>
</li>
<li><a name="'api_revision'"></a><b><code class="inline"><span class="w">api_revision</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as <i>5.6.1</i>, api_revision is the <code class="inline"><span class="n">5</span></code>
.
Prior to 5.5.640, the format was a floating point number,
like 5.00563.</p>
<p><i>perl.c</i>:incpush() and <i>lib/lib.pm</i> will automatically search in
<i>$sitelib/.</i>. for older directories back to the limit specified
by these api_ variables. This is only useful if you have a
perl library directory tree structured like the default one.
See <code class="inline"><span class="w">INSTALL</span></code>
for how this works. The versioned site_perl
directory was introduced in 5.005, so that is the lowest
possible value. The version list appropriate for the current
system is determined in <i>inc_version_list.U</i>.</p>
<p><code class="inline"><span class="w">XXX</span></code>
To do: Since compatibility can depend on compile time
options (such as bincompat, longlong, etc.) it should
(perhaps) be set by Configure, but currently it isn't.
Currently, we read a hard-wired value from <i>patchlevel.h</i>.
Perhaps what we ought to do is take the hard-wired value from
<i>patchlevel.h</i> but then modify it if the current Configure
options warrant. <i>patchlevel.h</i> then would use an #ifdef guard.</p>
</li>
<li><a name="'api_subversion'"></a><b><code class="inline"><span class="w">api_subversion</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as <i>5.6.1</i>, api_subversion is the <code class="inline"><span class="n">1</span></code>
. See api_revision for
full details.</p>
</li>
<li><a name="'api_version'"></a><b><code class="inline"><span class="w">api_version</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as <i>5.6.1</i>, api_version is the <code class="inline"><span class="n">6</span></code>
. See api_revision for
full details. As a special case, 5.5.0 is rendered in the
old-style as 5.005. (In the 5.005_0x maintenance series,
this was the only versioned directory in $sitelib.)</p>
</li>
<li><a name="'api_versionstring'"></a><b><code class="inline"><span class="w">api_versionstring</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>This variable combines api_revision, api_version, and
api_subversion in a format such as 5.6.1 (or 5_6_1) suitable
for use as a directory name. This is filesystem dependent.</p>
</li>
<li><a name="'ar'"></a><b><code class="inline"><span class="w">ar</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the ar program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">ar</span></code>
and is not useful.</p>
</li>
<li><a name="'archlib'"></a><b><code class="inline"><span class="w">archlib</span></code>
</b>
<p>From <i>archlib.U</i>:</p>
<p>This variable holds the name of the directory in which the user wants
to put architecture-dependent public library files for $package.
It is most often a local directory such as <i>/usr/local/lib</i>.
Programs using this variable must be prepared to deal
with filename expansion.</p>
</li>
<li><a name="'archlibexp'"></a><b><code class="inline"><span class="w">archlibexp</span></code>
</b>
<p>From <i>archlib.U</i>:</p>
<p>This variable is the same as the archlib variable, but is
filename expanded at configuration time, for convenient use.</p>
</li>
<li><a name="'archname'"></a><b><code class="inline"><span class="w">archname</span></code>
</b>
<p>From <i>archname.U</i>:</p>
<p>This variable is a short name to characterize the current
architecture. It is used mainly to construct the default archlib.</p>
</li>
<li><a name="'archname64'"></a><b><code class="inline"><span class="w">archname64</span></code>
</b>
<p>From <i>use64bits.U</i>:</p>
<p>This variable is used for the 64-bitness part of $archname.</p>
</li>
<li><a name="'archobjs'"></a><b><code class="inline"><span class="w">archobjs</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This variable defines any additional objects that must be linked
in with the program on this architecture. On unix, it is usually
empty. It is typically used to include emulations of unix calls
or other facilities. For perl on <i>OS/2</i>, for example, this would
include <i>os2/os2.obj</i>.</p>
</li>
<li><a name="'asctime_r_proto'"></a><b><code class="inline"><span class="w">asctime_r_proto</span></code>
</b>
<p>From <i>d_asctime_r.U</i>:</p>
<p>This variable encodes the prototype of asctime_r.
It is zero if d_asctime_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_asctime_r
is defined.</p>
</li>
<li><a name="'awk'"></a><b><code class="inline"><span class="w">awk</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the awk program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">awk</span></code>
and is not useful.</p>
</li>
</ul>
<a name="b"></a><h2>b</h2>
<ul>
<li><a name="'baserev'"></a><b><code class="inline"><span class="w">baserev</span></code>
</b>
<p>From <i>baserev.U</i>:</p>
<p>The base revision level of this package, from the <i>.package</i> file.</p>
</li>
<li><a name="'bash'"></a><b><code class="inline"><span class="w">bash</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'bin'"></a><b><code class="inline"><span class="w">bin</span></code>
</b>
<p>From <i>bin.U</i>:</p>
<p>This variable holds the name of the directory in which the user wants
to put publicly executable images for the package in question. It
is most often a local directory such as <i>/usr/local/bin</i>. Programs using
this variable must be prepared to deal with <i>~name</i> substitution.</p>
</li>
<li><a name="'binexp'"></a><b><code class="inline"><span class="w">binexp</span></code>
</b>
<p>From <i>bin.U</i>:</p>
<p>This is the same as the bin variable, but is filename expanded at
configuration time, for use in your makefiles.</p>
</li>
<li><a name="'bison'"></a><b><code class="inline"><span class="w">bison</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the bison program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">bison</span></code>
and is not useful.</p>
</li>
<li><a name="'byacc'"></a><b><code class="inline"><span class="w">byacc</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the byacc program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">byacc</span></code>
and is not useful.</p>
</li>
<li><a name="'byteorder'"></a><b><code class="inline"><span class="w">byteorder</span></code>
</b>
<p>From <i>byteorder.U</i>:</p>
<p>This variable holds the byte order in a <code class="inline"><span class="w">UV</span></code>
. In the following,
larger digits indicate more significance. The variable byteorder
is either 4321 on a big-endian machine, or 1234 on a little-endian,
or 87654321 on a Cray ... or 3412 with weird order !</p>
</li>
</ul>
<a name="c"></a><h2>c</h2>
<ul>
<li><a name="'c'"></a><b><code class="inline"><span class="w">c</span></code>
</b>
<p>From <i>n.U</i>:</p>
<p>This variable contains the \c string if that is what causes the echo
command to suppress newline. Otherwise it is null. Correct usage is
$echo $n "prompt for a question: $c".</p>
</li>
<li><a name="'castflags'"></a><b><code class="inline"><span class="w">castflags</span></code>
</b>
<p>From <i>d_castneg.U</i>:</p>
<p>This variable contains a flag that precise difficulties the
compiler has casting odd floating values to unsigned long:
0 = ok
1 = couldn't cast < 0
2 = couldn't cast >= 0x80000000
4 = couldn't cast in argument expression list</p>
</li>
<li><a name="'cat'"></a><b><code class="inline"><span class="w">cat</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the cat program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">cat</span></code>
and is not useful.</p>
</li>
<li><a name="'cc'"></a><b><code class="inline"><span class="w">cc</span></code>
</b>
<p>From <i>cc.U</i>:</p>
<p>This variable holds the name of a command to execute a C compiler which
can resolve multiple global references that happen to have the same
name. Usual values are <code class="inline"><span class="w">cc</span></code>
and <code class="inline"><span class="w">gcc</span></code>
.
Fervent <code class="inline"><span class="w">ANSI</span></code>
compilers may be called <code class="inline"><span class="w">c89</span></code>
. <code class="inline"><span class="w">AIX</span></code>
has xlc.</p>
</li>
<li><a name="'cccdlflags'"></a><b><code class="inline"><span class="w">cccdlflags</span></code>
</b>
<p>From <i>dlsrc.U</i>:</p>
<p>This variable contains any special flags that might need to be
passed with <code class="inline"><span class="w">cc</span> -c</code>
to compile modules to be used to create a shared
library that will be used for dynamic loading. For hpux, this
should be +z. It is up to the makefile to use it.</p>
</li>
<li><a name="'ccdlflags'"></a><b><code class="inline"><span class="w">ccdlflags</span></code>
</b>
<p>From <i>dlsrc.U</i>:</p>
<p>This variable contains any special flags that might need to be
passed to cc to link with a shared library for dynamic loading.
It is up to the makefile to use it. For sunos 4.1, it should
be empty.</p>
</li>
<li><a name="'ccflags'"></a><b><code class="inline"><span class="w">ccflags</span></code>
</b>
<p>From <i>ccflags.U</i>:</p>
<p>This variable contains any additional C compiler flags desired by
the user. It is up to the Makefile to use this.</p>
</li>
<li><a name="'ccflags_uselargefiles'"></a><b><code class="inline"><span class="w">ccflags_uselargefiles</span></code>
</b>
<p>From <i>uselfs.U</i>:</p>
<p>This variable contains the compiler flags needed by large file builds
and added to ccflags by hints files.</p>
</li>
<li><a name="'ccname'"></a><b><code class="inline"><span class="w">ccname</span></code>
</b>
<p>From <i>Checkcc.U</i>:</p>
<p>This can set either by hints files or by Configure. If using
gcc, this is gcc, and if not, usually equal to cc, unimpressive, no?
Some platforms, however, make good use of this by storing the
flavor of the C compiler being used here. For example if using
the Sun WorkShop suite, ccname will be <code class="inline"><span class="w">workshop</span></code>
.</p>
</li>
<li><a name="'ccsymbols'"></a><b><code class="inline"><span class="w">ccsymbols</span></code>
</b>
<p>From <i>Cppsym.U</i>:</p>
<p>The variable contains the symbols defined by the C compiler alone.
The symbols defined by cpp or by cc when it calls cpp are not in
this list, see cppsymbols and cppccsymbols.
The list is a space-separated list of symbol=value tokens.</p>
</li>
<li><a name="'ccversion'"></a><b><code class="inline"><span class="w">ccversion</span></code>
</b>
<p>From <i>Checkcc.U</i>:</p>
<p>This can set either by hints files or by Configure. If using
a (non-gcc) vendor cc, this variable may contain a version for
the compiler.</p>
</li>
<li><a name="'cf_by'"></a><b><code class="inline"><span class="w">cf_by</span></code>
</b>
<p>From <i>cf_who.U</i>:</p>
<p>Login name of the person who ran the Configure script and answered the
questions. This is used to tag both <i>config.sh</i> and <i>config_h.SH</i>.</p>
</li>
<li><a name="'cf_email'"></a><b><code class="inline"><span class="w">cf_email</span></code>
</b>
<p>From <i>cf_email.U</i>:</p>
<p>Electronic mail address of the person who ran Configure. This can be
used by units that require the user's e-mail, like <i>MailList.U</i>.</p>
</li>
<li><a name="'cf_time'"></a><b><code class="inline"><span class="w">cf_time</span></code>
</b>
<p>From <i>cf_who.U</i>:</p>
<p>Holds the output of the <code class="inline"><span class="w">date</span></code>
command when the configuration file was
produced. This is used to tag both <i>config.sh</i> and <i>config_h.SH</i>.</p>
</li>
<li><a name="'chgrp'"></a><b><code class="inline"><span class="w">chgrp</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'chmod'"></a><b><code class="inline"><a class="l_k" href="functions/chmod.html">chmod</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the chmod program. After Configure runs,
the value is reset to a plain <code class="inline"><a class="l_k" href="functions/chmod.html">chmod</a></code> and is not useful.</p>
</li>
<li><a name="'chown'"></a><b><code class="inline"><a class="l_k" href="functions/chown.html">chown</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'clocktype'"></a><b><code class="inline"><span class="w">clocktype</span></code>
</b>
<p>From <i>d_times.U</i>:</p>
<p>This variable holds the type returned by times(). It can be long,
or clock_t on <code class="inline"><span class="w">BSD</span></code>
sites (in which case <sys/types.h> should be
included).</p>
</li>
<li><a name="'comm'"></a><b><code class="inline"><span class="w">comm</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the comm program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">comm</span></code>
and is not useful.</p>
</li>
<li><a name="'compress'"></a><b><code class="inline"><span class="w">compress</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'contains'"></a><b><code class="inline"><span class="w">contains</span></code>
</b>
<p>From <i>contains.U</i>:</p>
<p>This variable holds the command to do a grep with a proper return
status. On most sane systems it is simply <code class="inline"><a class="l_k" href="functions/grep.html">grep</a></code>. On insane systems
it is a grep followed by a cat followed by a test. This variable
is primarily for the use of other Configure units.</p>
</li>
<li><a name="'cp'"></a><b><code class="inline"><span class="w">cp</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the cp program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">cp</span></code>
and is not useful.</p>
</li>
<li><a name="'cpio'"></a><b><code class="inline"><span class="w">cpio</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'cpp'"></a><b><code class="inline"><span class="w">cpp</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the cpp program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">cpp</span></code>
and is not useful.</p>
</li>
<li><a name="'cpp_stuff'"></a><b><code class="inline"><span class="w">cpp_stuff</span></code>
</b>
<p>From <i>cpp_stuff.U</i>:</p>
<p>This variable contains an identification of the concatenation mechanism
used by the C preprocessor.</p>
</li>
<li><a name="'cppccsymbols'"></a><b><code class="inline"><span class="w">cppccsymbols</span></code>
</b>
<p>From <i>Cppsym.U</i>:</p>
<p>The variable contains the symbols defined by the C compiler
when it calls cpp. The symbols defined by the cc alone or cpp
alone are not in this list, see ccsymbols and cppsymbols.
The list is a space-separated list of symbol=value tokens.</p>
</li>
<li><a name="'cppflags'"></a><b><code class="inline"><span class="w">cppflags</span></code>
</b>
<p>From <i>ccflags.U</i>:</p>
<p>This variable holds the flags that will be passed to the C pre-
processor. It is up to the Makefile to use it.</p>
</li>
<li><a name="'cpplast'"></a><b><code class="inline"><span class="w">cpplast</span></code>
</b>
<p>From <i>cppstdin.U</i>:</p>
<p>This variable has the same functionality as cppminus, only it applies
to cpprun and not cppstdin.</p>
</li>
<li><a name="'cppminus'"></a><b><code class="inline"><span class="w">cppminus</span></code>
</b>
<p>From <i>cppstdin.U</i>:</p>
<p>This variable contains the second part of the string which will invoke
the C preprocessor on the standard input and produce to standard
output. This variable will have the value <code class="inline">-</code>
if cppstdin needs
a minus to specify standard input, otherwise the value is "".</p>
</li>
<li><a name="'cpprun'"></a><b><code class="inline"><span class="w">cpprun</span></code>
</b>
<p>From <i>cppstdin.U</i>:</p>
<p>This variable contains the command which will invoke a C preprocessor
on standard input and put the output to stdout. It is guaranteed not
to be a wrapper and may be a null string if no preprocessor can be
made directly available. This preprocessor might be different from the
one used by the C compiler. Don't forget to append cpplast after the
preprocessor options.</p>
</li>
<li><a name="'cppstdin'"></a><b><code class="inline"><span class="w">cppstdin</span></code>
</b>
<p>From <i>cppstdin.U</i>:</p>
<p>This variable contains the command which will invoke the C
preprocessor on standard input and put the output to stdout.
It is primarily used by other Configure units that ask about
preprocessor symbols.</p>
</li>
<li><a name="'cppsymbols'"></a><b><code class="inline"><span class="w">cppsymbols</span></code>
</b>
<p>From <i>Cppsym.U</i>:</p>
<p>The variable contains the symbols defined by the C preprocessor
alone. The symbols defined by cc or by cc when it calls cpp are
not in this list, see ccsymbols and cppccsymbols.
The list is a space-separated list of symbol=value tokens.</p>
</li>
<li><a name="'crypt_r_proto'"></a><b><code class="inline"><span class="w">crypt_r_proto</span></code>
</b>
<p>From <i>d_crypt_r.U</i>:</p>
<p>This variable encodes the prototype of crypt_r.
It is zero if d_crypt_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_crypt_r
is defined.</p>
</li>
<li><a name="'cryptlib'"></a><b><code class="inline"><span class="w">cryptlib</span></code>
</b>
<p>From <i>d_crypt.U</i>:</p>
<p>This variable holds -lcrypt or the path to a <i>libcrypt.a</i> archive if
the crypt() function is not defined in the standard C library. It is
up to the Makefile to use this.</p>
</li>
<li><a name="'csh'"></a><b><code class="inline"><span class="w">csh</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the csh program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">csh</span></code>
and is not useful.</p>
</li>
<li><a name="'ctermid_r_proto'"></a><b><code class="inline"><span class="w">ctermid_r_proto</span></code>
</b>
<p>From <i>d_ctermid_r.U</i>:</p>
<p>This variable encodes the prototype of ctermid_r.
It is zero if d_ctermid_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_ctermid_r
is defined.</p>
</li>
<li><a name="'ctime_r_proto'"></a><b><code class="inline"><span class="w">ctime_r_proto</span></code>
</b>
<p>From <i>d_ctime_r.U</i>:</p>
<p>This variable encodes the prototype of ctime_r.
It is zero if d_ctime_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_ctime_r
is defined.</p>
</li>
</ul>
<a name="d"></a><h2>d</h2>
<ul>
<li><a name="'d__fwalk'"></a><b><code class="inline"><span class="w">d__fwalk</span></code>
</b>
<p>From <i>d__fwalk.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS__FWALK</span></code>
if _fwalk() is
available to apply a function to all the file handles.</p>
</li>
<li><a name="'d_access'"></a><b><code class="inline"><span class="w">d_access</span></code>
</b>
<p>From <i>d_access.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_ACCESS</span></code>
if the access() system
call is available to check for access permissions using real IDs.</p>
</li>
<li><a name="'d_accessx'"></a><b><code class="inline"><span class="w">d_accessx</span></code>
</b>
<p>From <i>d_accessx.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ACCESSX</span></code>
symbol, which
indicates to the C program that the accessx() routine is available.</p>
</li>
<li><a name="'d_aintl'"></a><b><code class="inline"><span class="w">d_aintl</span></code>
</b>
<p>From <i>d_aintl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_AINTL</span></code>
symbol, which
indicates to the C program that the aintl() routine is available.
If copysignl is also present we can emulate modfl.</p>
</li>
<li><a name="'d_alarm'"></a><b><code class="inline"><span class="w">d_alarm</span></code>
</b>
<p>From <i>d_alarm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ALARM</span></code>
symbol, which
indicates to the C program that the alarm() routine is available.</p>
</li>
<li><a name="'d_archlib'"></a><b><code class="inline"><span class="w">d_archlib</span></code>
</b>
<p>From <i>archlib.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">ARCHLIB</span></code>
to hold the pathname
of architecture-dependent library files for $package. If
$archlib is the same as $privlib, then this is set to undef.</p>
</li>
<li><a name="'d_asctime_r'"></a><b><code class="inline"><span class="w">d_asctime_r</span></code>
</b>
<p>From <i>d_asctime_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ASCTIME_R</span></code>
symbol,
which indicates to the C program that the asctime_r()
routine is available.</p>
</li>
<li><a name="'d_atolf'"></a><b><code class="inline"><span class="w">d_atolf</span></code>
</b>
<p>From <i>atolf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ATOLF</span></code>
symbol, which
indicates to the C program that the atolf() routine is available.</p>
</li>
<li><a name="'d_atoll'"></a><b><code class="inline"><span class="w">d_atoll</span></code>
</b>
<p>From <i>atoll.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ATOLL</span></code>
symbol, which
indicates to the C program that the atoll() routine is available.</p>
</li>
<li><a name="'d_attribute_format'"></a><b><code class="inline"><span class="w">d_attribute_format</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HASATTRIBUTE_FORMAT</span></code>
, which
indicates the C compiler can check for printf-like formats.</p>
</li>
<li><a name="'d_attribute_malloc'"></a><b><code class="inline"><span class="w">d_attribute_malloc</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HASATTRIBUTE_MALLOC</span></code>
, which
indicates the C compiler can understand functions as having
malloc-like semantics.</p>
</li>
<li><a name="'d_attribute_nonnull'"></a><b><code class="inline"><span class="w">d_attribute_nonnull</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HASATTRIBUTE_NONNULL</span></code>
, which
indicates that the C compiler can know that certain arguments
must not be <code class="inline"><span class="w">NULL</span></code>
, and will check accordingly at compile time.</p>
</li>
<li><a name="'d_attribute_noreturn'"></a><b><code class="inline"><span class="w">d_attribute_noreturn</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HASATTRIBUTE_NORETURN</span></code>
, which
indicates that the C compiler can know that certain functions
are guaranteed never to return.</p>
</li>
<li><a name="'d_attribute_pure'"></a><b><code class="inline"><span class="w">d_attribute_pure</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HASATTRIBUTE_PURE</span></code>
, which
indicates that the C compiler can know that certain functions
are <code class="inline"><span class="w">pure</span></code>
functions, meaning that they have no side effects, and
only rely on function input <i>and/or</i> global data for their results.</p>
</li>
<li><a name="'d_attribute_unused'"></a><b><code class="inline"><span class="w">d_attribute_unused</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HASATTRIBUTE_UNUSED</span></code>
, which
indicates that the C compiler can know that certain variables
and arguments may not always be used, and to not throw warnings
if they don't get used.</p>
</li>
<li><a name="'d_attribute_warn_unused_result'"></a><b><code class="inline"><span class="w">d_attribute_warn_unused_result</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines
<code class="inline"><span class="w">HASATTRIBUTE_WARN_UNUSED_RESULT</span></code>
, which indicates that the C
compiler can know that certain functions have a return values
that must not be ignored, such as malloc() or open().</p>
</li>
<li><a name="'d_bcmp'"></a><b><code class="inline"><span class="w">d_bcmp</span></code>
</b>
<p>From <i>d_bcmp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_BCMP</span></code>
symbol if
the bcmp() routine is available to compare strings.</p>
</li>
<li><a name="'d_bcopy'"></a><b><code class="inline"><span class="w">d_bcopy</span></code>
</b>
<p>From <i>d_bcopy.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_BCOPY</span></code>
symbol if
the bcopy() routine is available to copy strings.</p>
</li>
<li><a name="'d_bsd'"></a><b><code class="inline"><span class="w">d_bsd</span></code>
</b>
<p>From <i>Guess.U</i>:</p>
<p>This symbol conditionally defines the symbol <code class="inline"><span class="w">BSD</span></code>
when running on a
<code class="inline"><span class="w">BSD</span></code>
system.</p>
</li>
<li><a name="'d_bsdgetpgrp'"></a><b><code class="inline"><span class="w">d_bsdgetpgrp</span></code>
</b>
<p>From <i>d_getpgrp.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_BSD_GETPGRP</span></code>
if
getpgrp needs one arguments whereas <code class="inline"><span class="w">USG</span></code>
one needs none.</p>
</li>
<li><a name="'d_bsdsetpgrp'"></a><b><code class="inline"><span class="w">d_bsdsetpgrp</span></code>
</b>
<p>From <i>d_setpgrp.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_BSD_SETPGRP</span></code>
if
setpgrp needs two arguments whereas <code class="inline"><span class="w">USG</span></code>
one needs none.
See also d_setpgid for a <code class="inline"><span class="w">POSIX</span></code>
interface.</p>
</li>
<li><a name="'d_builtin_choose_expr'"></a><b><code class="inline"><span class="w">d_builtin_choose_expr</span></code>
</b>
<p>From <i>d_builtin.U</i>:</p>
<p>This conditionally defines <code class="inline"><span class="w">HAS_BUILTIN_CHOOSE_EXPR</span></code>
, which
indicates that the compiler supports __builtin_choose_expr(x,y,z).
This built-in function is analogous to the <code class="inline">x?y:z</code> operator in C,
except that the expression returned has its type unaltered by
promotion rules. Also, the built-in function does not evaluate
the expression that was not chosen.</p>
</li>
<li><a name="'d_builtin_expect'"></a><b><code class="inline"><span class="w">d_builtin_expect</span></code>
</b>
<p>From <i>d_builtin.U</i>:</p>
<p>This conditionally defines <code class="inline"><span class="w">HAS_BUILTIN_EXPECT</span></code>
, which indicates
that the compiler supports __builtin_expect(exp,c). You may use
__builtin_expect to provide the compiler with branch prediction
information.</p>
</li>
<li><a name="'d_bzero'"></a><b><code class="inline"><span class="w">d_bzero</span></code>
</b>
<p>From <i>d_bzero.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_BZERO</span></code>
symbol if
the bzero() routine is available to set memory to 0.</p>
</li>
<li><a name="'d_c99_variadic_macros'"></a><b><code class="inline"><span class="w">d_c99_variadic_macros</span></code>
</b>
<p>From <i>d_c99_variadic.U</i>:</p>
<p>This variable conditionally defines the HAS_C99_VARIADIC_MACROS
symbol, which indicates to the C program that C99 variadic macros
are available.</p>
</li>
<li><a name="'d_casti32'"></a><b><code class="inline"><span class="w">d_casti32</span></code>
</b>
<p>From <i>d_casti32.U</i>:</p>
<p>This variable conditionally defines CASTI32, which indicates
whether the C compiler can cast large floats to 32-bit ints.</p>
</li>
<li><a name="'d_castneg'"></a><b><code class="inline"><span class="w">d_castneg</span></code>
</b>
<p>From <i>d_castneg.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">CASTNEG</span></code>
, which indicates
wether the C compiler can cast negative float to unsigned.</p>
</li>
<li><a name="'d_charvspr'"></a><b><code class="inline"><span class="w">d_charvspr</span></code>
</b>
<p>From <i>d_vprintf.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">CHARVSPRINTF</span></code>
if this system
has vsprintf returning type (char*). The trend seems to be to
declare it as "int vsprintf()".</p>
</li>
<li><a name="'d_chown'"></a><b><code class="inline"><span class="w">d_chown</span></code>
</b>
<p>From <i>d_chown.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CHOWN</span></code>
symbol, which
indicates to the C program that the chown() routine is available.</p>
</li>
<li><a name="'d_chroot'"></a><b><code class="inline"><span class="w">d_chroot</span></code>
</b>
<p>From <i>d_chroot.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CHROOT</span></code>
symbol, which
indicates to the C program that the chroot() routine is available.</p>
</li>
<li><a name="'d_chsize'"></a><b><code class="inline"><span class="w">d_chsize</span></code>
</b>
<p>From <i>d_chsize.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">CHSIZE</span></code>
symbol, which
indicates to the C program that the chsize() routine is available
to truncate files. You might need a -lx to get this routine.</p>
</li>
<li><a name="'d_class'"></a><b><code class="inline"><span class="w">d_class</span></code>
</b>
<p>From <i>d_class.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CLASS</span></code>
symbol, which
indicates to the C program that the class() routine is available.</p>
</li>
<li><a name="'d_clearenv'"></a><b><code class="inline"><span class="w">d_clearenv</span></code>
</b>
<p>From <i>d_clearenv.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CLEARENV</span></code>
symbol, which
indicates to the C program that the clearenv () routine is available.</p>
</li>
<li><a name="'d_closedir'"></a><b><code class="inline"><span class="w">d_closedir</span></code>
</b>
<p>From <i>d_closedir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_CLOSEDIR</span></code>
if closedir() is
available.</p>
</li>
<li><a name="'d_cmsghdr_s'"></a><b><code class="inline"><span class="w">d_cmsghdr_s</span></code>
</b>
<p>From <i>d_cmsghdr_s.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRUCT_CMSGHDR</span></code>
symbol,
which indicates that the struct cmsghdr is supported.</p>
</li>
<li><a name="'d_const'"></a><b><code class="inline"><span class="w">d_const</span></code>
</b>
<p>From <i>d_const.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HASCONST</span></code>
symbol, which
indicates to the C program that this C compiler knows about the
const type.</p>
</li>
<li><a name="'d_copysignl'"></a><b><code class="inline"><span class="w">d_copysignl</span></code>
</b>
<p>From <i>d_copysignl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_COPYSIGNL</span></code>
symbol, which
indicates to the C program that the copysignl() routine is available.
If aintl is also present we can emulate modfl.</p>
</li>
<li><a name="'d_cplusplus'"></a><b><code class="inline"><span class="w">d_cplusplus</span></code>
</b>
<p>From <i>d_cplusplus.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_CPLUSPLUS</span></code>
symbol, which
indicates that a C++ compiler was used to compiled Perl and will be
used to compile extensions.</p>
</li>
<li><a name="'d_crypt'"></a><b><code class="inline"><span class="w">d_crypt</span></code>
</b>
<p>From <i>d_crypt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">CRYPT</span></code>
symbol, which
indicates to the C program that the crypt() routine is available
to encrypt passwords and the like.</p>
</li>
<li><a name="'d_crypt_r'"></a><b><code class="inline"><span class="w">d_crypt_r</span></code>
</b>
<p>From <i>d_crypt_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CRYPT_R</span></code>
symbol,
which indicates to the C program that the crypt_r()
routine is available.</p>
</li>
<li><a name="'d_csh'"></a><b><code class="inline"><span class="w">d_csh</span></code>
</b>
<p>From <i>d_csh.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">CSH</span></code>
symbol, which
indicates to the C program that the C-shell exists.</p>
</li>
<li><a name="'d_ctermid'"></a><b><code class="inline"><span class="w">d_ctermid</span></code>
</b>
<p>From <i>d_ctermid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">CTERMID</span></code>
if ctermid() is
available to generate filename for terminal.</p>
</li>
<li><a name="'d_ctermid_r'"></a><b><code class="inline"><span class="w">d_ctermid_r</span></code>
</b>
<p>From <i>d_ctermid_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CTERMID_R</span></code>
symbol,
which indicates to the C program that the ctermid_r()
routine is available.</p>
</li>
<li><a name="'d_ctime_r'"></a><b><code class="inline"><span class="w">d_ctime_r</span></code>
</b>
<p>From <i>d_ctime_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CTIME_R</span></code>
symbol,
which indicates to the C program that the ctime_r()
routine is available.</p>
</li>
<li><a name="'d_cuserid'"></a><b><code class="inline"><span class="w">d_cuserid</span></code>
</b>
<p>From <i>d_cuserid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_CUSERID</span></code>
symbol, which
indicates to the C program that the cuserid() routine is available
to get character login names.</p>
</li>
<li><a name="'d_dbl_dig'"></a><b><code class="inline"><span class="w">d_dbl_dig</span></code>
</b>
<p>From <i>d_dbl_dig.U</i>:</p>
<p>This variable conditionally defines d_dbl_dig if this system's
header files provide <code class="inline"><span class="w">DBL_DIG</span></code>
, which is the number of significant
digits in a double precision number.</p>
</li>
<li><a name="'d_dbminitproto'"></a><b><code class="inline"><span class="w">d_dbminitproto</span></code>
</b>
<p>From <i>d_dbminitproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_DBMINIT_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the dbminit() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_difftime'"></a><b><code class="inline"><span class="w">d_difftime</span></code>
</b>
<p>From <i>d_difftime.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_DIFFTIME</span></code>
symbol, which
indicates to the C program that the difftime() routine is available.</p>
</li>
<li><a name="'d_dir_dd_fd'"></a><b><code class="inline"><span class="w">d_dir_dd_fd</span></code>
</b>
<p>From <i>d_dir_dd_fd.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_DIR_DD_FD</span></code>
symbol, which
indicates that the <code class="inline"><span class="w">DIR</span></code>
directory stream type contains a member
variable called dd_fd.</p>
</li>
<li><a name="'d_dirfd'"></a><b><code class="inline"><span class="w">d_dirfd</span></code>
</b>
<p>From <i>d_dirfd.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_DIRFD</span></code>
constant,
which indicates to the C program that dirfd() is available
to return the file descriptor of a directory stream.</p>
</li>
<li><a name="'d_dirnamlen'"></a><b><code class="inline"><span class="w">d_dirnamlen</span></code>
</b>
<p>From <i>i_dirent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">DIRNAMLEN</span></code>
, which indicates
to the C program that the length of directory entry names is
provided by a d_namelen field.</p>
</li>
<li><a name="'d_dlerror'"></a><b><code class="inline"><span class="w">d_dlerror</span></code>
</b>
<p>From <i>d_dlerror.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_DLERROR</span></code>
symbol, which
indicates to the C program that the dlerror() routine is available.</p>
</li>
<li><a name="'d_dlopen'"></a><b><code class="inline"><span class="w">d_dlopen</span></code>
</b>
<p>From <i>d_dlopen.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_DLOPEN</span></code>
symbol, which
indicates to the C program that the dlopen() routine is available.</p>
</li>
<li><a name="'d_dlsymun'"></a><b><code class="inline"><span class="w">d_dlsymun</span></code>
</b>
<p>From <i>d_dlsymun.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">DLSYM_NEEDS_UNDERSCORE</span></code>
, which
indicates that we need to prepend an underscore to the symbol
name before calling dlsym().</p>
</li>
<li><a name="'d_dosuid'"></a><b><code class="inline"><span class="w">d_dosuid</span></code>
</b>
<p>From <i>d_dosuid.U</i>:</p>
<p>This variable conditionally defines the symbol <code class="inline"><span class="w">DOSUID</span></code>
, which
tells the C program that it should insert setuid emulation code
on hosts which have setuid #! scripts disabled.</p>
</li>
<li><a name="'d_drand48_r'"></a><b><code class="inline"><span class="w">d_drand48_r</span></code>
</b>
<p>From <i>d_drand48_r.U</i>:</p>
<p>This variable conditionally defines the HAS_DRAND48_R symbol,
which indicates to the C program that the drand48_r()
routine is available.</p>
</li>
<li><a name="'d_drand48proto'"></a><b><code class="inline"><span class="w">d_drand48proto</span></code>
</b>
<p>From <i>d_drand48proto.U</i>:</p>
<p>This variable conditionally defines the HAS_DRAND48_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the drand48() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_dup2'"></a><b><code class="inline"><span class="w">d_dup2</span></code>
</b>
<p>From <i>d_dup2.U</i>:</p>
<p>This variable conditionally defines HAS_DUP2 if dup2() is
available to duplicate file descriptors.</p>
</li>
<li><a name="'d_eaccess'"></a><b><code class="inline"><span class="w">d_eaccess</span></code>
</b>
<p>From <i>d_eaccess.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_EACCESS</span></code>
symbol, which
indicates to the C program that the eaccess() routine is available.</p>
</li>
<li><a name="'d_endgrent'"></a><b><code class="inline"><span class="w">d_endgrent</span></code>
</b>
<p>From <i>d_endgrent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDGRENT</span></code>
symbol, which
indicates to the C program that the endgrent() routine is available
for sequential access of the group database.</p>
</li>
<li><a name="'d_endgrent_r'"></a><b><code class="inline"><span class="w">d_endgrent_r</span></code>
</b>
<p>From <i>d_endgrent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDGRENT_R</span></code>
symbol,
which indicates to the C program that the endgrent_r()
routine is available.</p>
</li>
<li><a name="'d_endhent'"></a><b><code class="inline"><span class="w">d_endhent</span></code>
</b>
<p>From <i>d_endhent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_ENDHOSTENT</span></code>
if endhostent() is
available to close whatever was being used for host queries.</p>
</li>
<li><a name="'d_endhostent_r'"></a><b><code class="inline"><span class="w">d_endhostent_r</span></code>
</b>
<p>From <i>d_endhostent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDHOSTENT_R</span></code>
symbol,
which indicates to the C program that the endhostent_r()
routine is available.</p>
</li>
<li><a name="'d_endnent'"></a><b><code class="inline"><span class="w">d_endnent</span></code>
</b>
<p>From <i>d_endnent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_ENDNETENT</span></code>
if endnetent() is
available to close whatever was being used for network queries.</p>
</li>
<li><a name="'d_endnetent_r'"></a><b><code class="inline"><span class="w">d_endnetent_r</span></code>
</b>
<p>From <i>d_endnetent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDNETENT_R</span></code>
symbol,
which indicates to the C program that the endnetent_r()
routine is available.</p>
</li>
<li><a name="'d_endpent'"></a><b><code class="inline"><span class="w">d_endpent</span></code>
</b>
<p>From <i>d_endpent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_ENDPROTOENT</span></code>
if endprotoent() is
available to close whatever was being used for protocol queries.</p>
</li>
<li><a name="'d_endprotoent_r'"></a><b><code class="inline"><span class="w">d_endprotoent_r</span></code>
</b>
<p>From <i>d_endprotoent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDPROTOENT_R</span></code>
symbol,
which indicates to the C program that the endprotoent_r()
routine is available.</p>
</li>
<li><a name="'d_endpwent'"></a><b><code class="inline"><span class="w">d_endpwent</span></code>
</b>
<p>From <i>d_endpwent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDPWENT</span></code>
symbol, which
indicates to the C program that the endpwent() routine is available
for sequential access of the passwd database.</p>
</li>
<li><a name="'d_endpwent_r'"></a><b><code class="inline"><span class="w">d_endpwent_r</span></code>
</b>
<p>From <i>d_endpwent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDPWENT_R</span></code>
symbol,
which indicates to the C program that the endpwent_r()
routine is available.</p>
</li>
<li><a name="'d_endsent'"></a><b><code class="inline"><span class="w">d_endsent</span></code>
</b>
<p>From <i>d_endsent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_ENDSERVENT</span></code>
if endservent() is
available to close whatever was being used for service queries.</p>
</li>
<li><a name="'d_endservent_r'"></a><b><code class="inline"><span class="w">d_endservent_r</span></code>
</b>
<p>From <i>d_endservent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ENDSERVENT_R</span></code>
symbol,
which indicates to the C program that the endservent_r()
routine is available.</p>
</li>
<li><a name="'d_eofnblk'"></a><b><code class="inline"><span class="w">d_eofnblk</span></code>
</b>
<p>From <i>nblock_io.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">EOF_NONBLOCK</span></code>
if <code class="inline"><span class="w">EOF</span></code>
can be seen
when reading from a non-blocking I/O source.</p>
</li>
<li><a name="'d_eunice'"></a><b><code class="inline"><span class="w">d_eunice</span></code>
</b>
<p>From <i>Guess.U</i>:</p>
<p>This variable conditionally defines the symbols <code class="inline"><span class="w">EUNICE</span></code>
and <code class="inline"><span class="w">VAX</span></code>
, which
alerts the C program that it must deal with ideosyncracies of <code class="inline"><span class="w">VMS</span></code>
.</p>
</li>
<li><a name="'d_faststdio'"></a><b><code class="inline"><span class="w">d_faststdio</span></code>
</b>
<p>From <i>d_faststdio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FAST_STDIO</span></code>
symbol,
which indicates to the C program that the "fast stdio" is available
to manipulate the stdio buffers directly.</p>
</li>
<li><a name="'d_fchdir'"></a><b><code class="inline"><span class="w">d_fchdir</span></code>
</b>
<p>From <i>d_fchdir.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FCHDIR</span></code>
symbol, which
indicates to the C program that the fchdir() routine is available.</p>
</li>
<li><a name="'d_fchmod'"></a><b><code class="inline"><span class="w">d_fchmod</span></code>
</b>
<p>From <i>d_fchmod.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FCHMOD</span></code>
symbol, which
indicates to the C program that the fchmod() routine is available
to change mode of opened files.</p>
</li>
<li><a name="'d_fchown'"></a><b><code class="inline"><span class="w">d_fchown</span></code>
</b>
<p>From <i>d_fchown.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FCHOWN</span></code>
symbol, which
indicates to the C program that the fchown() routine is available
to change ownership of opened files.</p>
</li>
<li><a name="'d_fcntl'"></a><b><code class="inline"><span class="w">d_fcntl</span></code>
</b>
<p>From <i>d_fcntl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FCNTL</span></code>
symbol, and indicates
whether the fcntl() function exists</p>
</li>
<li><a name="'d_fcntl_can_lock'"></a><b><code class="inline"><span class="w">d_fcntl_can_lock</span></code>
</b>
<p>From <i>d_fcntl_can_lock.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">FCNTL_CAN_LOCK</span></code>
symbol
and indicates whether file locking with fcntl() works.</p>
</li>
<li><a name="'d_fd_macros'"></a><b><code class="inline"><span class="w">d_fd_macros</span></code>
</b>
<p>From <i>d_fd_set.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">HAS_FD_MACROS</span></code>
symbol,
which indicates if your C compiler knows about the macros which
manipulate an fd_set.</p>
</li>
<li><a name="'d_fd_set'"></a><b><code class="inline"><span class="w">d_fd_set</span></code>
</b>
<p>From <i>d_fd_set.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">HAS_FD_SET</span></code>
symbol,
which indicates if your C compiler knows about the fd_set typedef.</p>
</li>
<li><a name="'d_fds_bits'"></a><b><code class="inline"><span class="w">d_fds_bits</span></code>
</b>
<p>From <i>d_fd_set.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">HAS_FDS_BITS</span></code>
symbol,
which indicates if your fd_set typedef contains the fds_bits member.
If you have an fd_set typedef, but the dweebs who installed it did
a half-fast job and neglected to provide the macros to manipulate
an fd_set, <code class="inline"><span class="w">HAS_FDS_BITS</span></code>
will let us know how to fix the gaffe.</p>
</li>
<li><a name="'d_fgetpos'"></a><b><code class="inline"><span class="w">d_fgetpos</span></code>
</b>
<p>From <i>d_fgetpos.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_FGETPOS</span></code>
if fgetpos() is
available to get the file position indicator.</p>
</li>
<li><a name="'d_finite'"></a><b><code class="inline"><span class="w">d_finite</span></code>
</b>
<p>From <i>d_finite.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FINITE</span></code>
symbol, which
indicates to the C program that the finite() routine is available.</p>
</li>
<li><a name="'d_finitel'"></a><b><code class="inline"><span class="w">d_finitel</span></code>
</b>
<p>From <i>d_finitel.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FINITEL</span></code>
symbol, which
indicates to the C program that the finitel() routine is available.</p>
</li>
<li><a name="'d_flexfnam'"></a><b><code class="inline"><span class="w">d_flexfnam</span></code>
</b>
<p>From <i>d_flexfnam.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">FLEXFILENAMES</span></code>
symbol, which
indicates that the system supports filenames longer than 14 characters.</p>
</li>
<li><a name="'d_flock'"></a><b><code class="inline"><span class="w">d_flock</span></code>
</b>
<p>From <i>d_flock.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_FLOCK</span></code>
if flock() is
available to do file locking.</p>
</li>
<li><a name="'d_flockproto'"></a><b><code class="inline"><span class="w">d_flockproto</span></code>
</b>
<p>From <i>d_flockproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FLOCK_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the flock() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_fork'"></a><b><code class="inline"><span class="w">d_fork</span></code>
</b>
<p>From <i>d_fork.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FORK</span></code>
symbol, which
indicates to the C program that the fork() routine is available.</p>
</li>
<li><a name="'d_fp_class'"></a><b><code class="inline"><span class="w">d_fp_class</span></code>
</b>
<p>From <i>d_fp_class.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FP_CLASS</span></code>
symbol, which
indicates to the C program that the fp_class() routine is available.</p>
</li>
<li><a name="'d_fpathconf'"></a><b><code class="inline"><span class="w">d_fpathconf</span></code>
</b>
<p>From <i>d_pathconf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FPATHCONF</span></code>
symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given open file descriptor.</p>
</li>
<li><a name="'d_fpclass'"></a><b><code class="inline"><span class="w">d_fpclass</span></code>
</b>
<p>From <i>d_fpclass.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FPCLASS</span></code>
symbol, which
indicates to the C program that the fpclass() routine is available.</p>
</li>
<li><a name="'d_fpclassify'"></a><b><code class="inline"><span class="w">d_fpclassify</span></code>
</b>
<p>From <i>d_fpclassify.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FPCLASSIFY</span></code>
symbol, which
indicates to the C program that the fpclassify() routine is available.</p>
</li>
<li><a name="'d_fpclassl'"></a><b><code class="inline"><span class="w">d_fpclassl</span></code>
</b>
<p>From <i>d_fpclassl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FPCLASSL</span></code>
symbol, which
indicates to the C program that the fpclassl() routine is available.</p>
</li>
<li><a name="'d_fpos64_t'"></a><b><code class="inline"><span class="w">d_fpos64_t</span></code>
</b>
<p>From <i>d_fpos64_t.U</i>:</p>
<p>This symbol will be defined if the C compiler supports fpos64_t.</p>
</li>
<li><a name="'d_frexpl'"></a><b><code class="inline"><span class="w">d_frexpl</span></code>
</b>
<p>From <i>d_frexpl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FREXPL</span></code>
symbol, which
indicates to the C program that the frexpl() routine is available.</p>
</li>
<li><a name="'d_fs_data_s'"></a><b><code class="inline"><span class="w">d_fs_data_s</span></code>
</b>
<p>From <i>d_fs_data_s.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRUCT_FS_DATA</span></code>
symbol,
which indicates that the struct fs_data is supported.</p>
</li>
<li><a name="'d_fseeko'"></a><b><code class="inline"><span class="w">d_fseeko</span></code>
</b>
<p>From <i>d_fseeko.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FSEEKO</span></code>
symbol, which
indicates to the C program that the fseeko() routine is available.</p>
</li>
<li><a name="'d_fsetpos'"></a><b><code class="inline"><span class="w">d_fsetpos</span></code>
</b>
<p>From <i>d_fsetpos.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_FSETPOS</span></code>
if fsetpos() is
available to set the file position indicator.</p>
</li>
<li><a name="'d_fstatfs'"></a><b><code class="inline"><span class="w">d_fstatfs</span></code>
</b>
<p>From <i>d_fstatfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FSTATFS</span></code>
symbol, which
indicates to the C program that the fstatfs() routine is available.</p>
</li>
<li><a name="'d_fstatvfs'"></a><b><code class="inline"><span class="w">d_fstatvfs</span></code>
</b>
<p>From <i>d_statvfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FSTATVFS</span></code>
symbol, which
indicates to the C program that the fstatvfs() routine is available.</p>
</li>
<li><a name="'d_fsync'"></a><b><code class="inline"><span class="w">d_fsync</span></code>
</b>
<p>From <i>d_fsync.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FSYNC</span></code>
symbol, which
indicates to the C program that the fsync() routine is available.</p>
</li>
<li><a name="'d_ftello'"></a><b><code class="inline"><span class="w">d_ftello</span></code>
</b>
<p>From <i>d_ftello.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FTELLO</span></code>
symbol, which
indicates to the C program that the ftello() routine is available.</p>
</li>
<li><a name="'d_ftime'"></a><b><code class="inline"><span class="w">d_ftime</span></code>
</b>
<p>From <i>d_ftime.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FTIME</span></code>
symbol, which indicates
that the ftime() routine exists. The ftime() routine is basically
a sub-second accuracy clock.</p>
</li>
<li><a name="'d_futimes'"></a><b><code class="inline"><span class="w">d_futimes</span></code>
</b>
<p>From <i>d_futimes.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_FUTIMES</span></code>
symbol, which
indicates to the C program that the futimes() routine is available.</p>
</li>
<li><a name="'d_Gconvert'"></a><b><code class="inline"><span class="w">d_Gconvert</span></code>
</b>
<p>From <i>d_gconvert.U</i>:</p>
<p>This variable holds what Gconvert is defined as to convert
floating point numbers into strings. By default, Configure
sets <code class="inline"><span class="w">this</span></code>
macro to use the first of gconvert, gcvt, or sprintf
that pass sprintf-%g-like behaviour tests. If perl is using
long doubles, the macro uses the first of the following
functions that pass Configure's tests: qgcvt, sprintf (if
Configure knows how to make sprintf format long doubles--see
sPRIgldbl), gconvert, gcvt, and sprintf (casting to double).
The gconvert_preference and gconvert_ld_preference variables
can be used to alter Configure's preferences, for doubles and
long doubles, respectively. If present, they contain a
space-separated list of one or more of the above function
names in the order they should be tried.</p>
<p>d_Gconvert may be set to override Configure with a platform-
specific function. If this function expects a double, a
different value may need to be set by the <i>uselongdouble.cbu</i>
call-back unit so that long doubles can be formatted without
loss of precision.</p>
</li>
<li><a name="'d_getcwd'"></a><b><code class="inline"><span class="w">d_getcwd</span></code>
</b>
<p>From <i>d_getcwd.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETCWD</span></code>
symbol, which
indicates to the C program that the getcwd() routine is available
to get the current working directory.</p>
</li>
<li><a name="'d_getespwnam'"></a><b><code class="inline"><span class="w">d_getespwnam</span></code>
</b>
<p>From <i>d_getespwnam.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETESPWNAM</span></code>
if getespwnam() is
available to retrieve enchanced (shadow) password entries by name.</p>
</li>
<li><a name="'d_getfsstat'"></a><b><code class="inline"><span class="w">d_getfsstat</span></code>
</b>
<p>From <i>d_getfsstat.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETFSSTAT</span></code>
symbol, which
indicates to the C program that the getfsstat() routine is available.</p>
</li>
<li><a name="'d_getgrent'"></a><b><code class="inline"><span class="w">d_getgrent</span></code>
</b>
<p>From <i>d_getgrent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETGRENT</span></code>
symbol, which
indicates to the C program that the getgrent() routine is available
for sequential access of the group database.</p>
</li>
<li><a name="'d_getgrent_r'"></a><b><code class="inline"><span class="w">d_getgrent_r</span></code>
</b>
<p>From <i>d_getgrent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETGRENT_R</span></code>
symbol,
which indicates to the C program that the getgrent_r()
routine is available.</p>
</li>
<li><a name="'d_getgrgid_r'"></a><b><code class="inline"><span class="w">d_getgrgid_r</span></code>
</b>
<p>From <i>d_getgrgid_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETGRGID_R</span></code>
symbol,
which indicates to the C program that the getgrgid_r()
routine is available.</p>
</li>
<li><a name="'d_getgrnam_r'"></a><b><code class="inline"><span class="w">d_getgrnam_r</span></code>
</b>
<p>From <i>d_getgrnam_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETGRNAM_R</span></code>
symbol,
which indicates to the C program that the getgrnam_r()
routine is available.</p>
</li>
<li><a name="'d_getgrps'"></a><b><code class="inline"><span class="w">d_getgrps</span></code>
</b>
<p>From <i>d_getgrps.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETGROUPS</span></code>
symbol, which
indicates to the C program that the getgroups() routine is available
to get the list of process groups.</p>
</li>
<li><a name="'d_gethbyaddr'"></a><b><code class="inline"><span class="w">d_gethbyaddr</span></code>
</b>
<p>From <i>d_gethbyad.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOSTBYADDR</span></code>
symbol, which
indicates to the C program that the gethostbyaddr() routine is available
to look up hosts by their <code class="inline"><span class="w">IP</span></code>
addresses.</p>
</li>
<li><a name="'d_gethbyname'"></a><b><code class="inline"><span class="w">d_gethbyname</span></code>
</b>
<p>From <i>d_gethbynm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOSTBYNAME</span></code>
symbol, which
indicates to the C program that the gethostbyname() routine is available
to look up host names in some data base or other.</p>
</li>
<li><a name="'d_gethent'"></a><b><code class="inline"><span class="w">d_gethent</span></code>
</b>
<p>From <i>d_gethent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETHOSTENT</span></code>
if gethostent() is
available to look up host names in some data base or another.</p>
</li>
<li><a name="'d_gethname'"></a><b><code class="inline"><span class="w">d_gethname</span></code>
</b>
<p>From <i>d_gethname.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOSTNAME</span></code>
symbol, which
indicates to the C program that the gethostname() routine may be
used to derive the host name.</p>
</li>
<li><a name="'d_gethostbyaddr_r'"></a><b><code class="inline"><span class="w">d_gethostbyaddr_r</span></code>
</b>
<p>From <i>d_gethostbyaddr_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOSTBYADDR_R</span></code>
symbol,
which indicates to the C program that the gethostbyaddr_r()
routine is available.</p>
</li>
<li><a name="'d_gethostbyname_r'"></a><b><code class="inline"><span class="w">d_gethostbyname_r</span></code>
</b>
<p>From <i>d_gethostbyname_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOSTBYNAME_R</span></code>
symbol,
which indicates to the C program that the gethostbyname_r()
routine is available.</p>
</li>
<li><a name="'d_gethostent_r'"></a><b><code class="inline"><span class="w">d_gethostent_r</span></code>
</b>
<p>From <i>d_gethostent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOSTENT_R</span></code>
symbol,
which indicates to the C program that the gethostent_r()
routine is available.</p>
</li>
<li><a name="'d_gethostprotos'"></a><b><code class="inline"><span class="w">d_gethostprotos</span></code>
</b>
<p>From <i>d_gethostprotos.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETHOST_PROTOS</span></code>
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various gethost*() functions.
See also <i>netdbtype.U</i> for probing for various netdb types.</p>
</li>
<li><a name="'d_getitimer'"></a><b><code class="inline"><span class="w">d_getitimer</span></code>
</b>
<p>From <i>d_getitimer.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETITIMER</span></code>
symbol, which
indicates to the C program that the getitimer() routine is available.</p>
</li>
<li><a name="'d_getlogin'"></a><b><code class="inline"><span class="w">d_getlogin</span></code>
</b>
<p>From <i>d_getlogin.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETLOGIN</span></code>
symbol, which
indicates to the C program that the getlogin() routine is available
to get the login name.</p>
</li>
<li><a name="'d_getlogin_r'"></a><b><code class="inline"><span class="w">d_getlogin_r</span></code>
</b>
<p>From <i>d_getlogin_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETLOGIN_R</span></code>
symbol,
which indicates to the C program that the getlogin_r()
routine is available.</p>
</li>
<li><a name="'d_getmnt'"></a><b><code class="inline"><span class="w">d_getmnt</span></code>
</b>
<p>From <i>d_getmnt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETMNT</span></code>
symbol, which
indicates to the C program that the getmnt() routine is available
to retrieve one or more mount info blocks by filename.</p>
</li>
<li><a name="'d_getmntent'"></a><b><code class="inline"><span class="w">d_getmntent</span></code>
</b>
<p>From <i>d_getmntent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETMNTENT</span></code>
symbol, which
indicates to the C program that the getmntent() routine is available
to iterate through mounted files to get their mount info.</p>
</li>
<li><a name="'d_getnbyaddr'"></a><b><code class="inline"><span class="w">d_getnbyaddr</span></code>
</b>
<p>From <i>d_getnbyad.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETNETBYADDR</span></code>
symbol, which
indicates to the C program that the getnetbyaddr() routine is available
to look up networks by their <code class="inline"><span class="w">IP</span></code>
addresses.</p>
</li>
<li><a name="'d_getnbyname'"></a><b><code class="inline"><span class="w">d_getnbyname</span></code>
</b>
<p>From <i>d_getnbynm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETNETBYNAME</span></code>
symbol, which
indicates to the C program that the getnetbyname() routine is available
to look up networks by their names.</p>
</li>
<li><a name="'d_getnent'"></a><b><code class="inline"><span class="w">d_getnent</span></code>
</b>
<p>From <i>d_getnent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETNETENT</span></code>
if getnetent() is
available to look up network names in some data base or another.</p>
</li>
<li><a name="'d_getnetbyaddr_r'"></a><b><code class="inline"><span class="w">d_getnetbyaddr_r</span></code>
</b>
<p>From <i>d_getnetbyaddr_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETNETBYADDR_R</span></code>
symbol,
which indicates to the C program that the getnetbyaddr_r()
routine is available.</p>
</li>
<li><a name="'d_getnetbyname_r'"></a><b><code class="inline"><span class="w">d_getnetbyname_r</span></code>
</b>
<p>From <i>d_getnetbyname_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETNETBYNAME_R</span></code>
symbol,
which indicates to the C program that the getnetbyname_r()
routine is available.</p>
</li>
<li><a name="'d_getnetent_r'"></a><b><code class="inline"><span class="w">d_getnetent_r</span></code>
</b>
<p>From <i>d_getnetent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETNETENT_R</span></code>
symbol,
which indicates to the C program that the getnetent_r()
routine is available.</p>
</li>
<li><a name="'d_getnetprotos'"></a><b><code class="inline"><span class="w">d_getnetprotos</span></code>
</b>
<p>From <i>d_getnetprotos.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETNET_PROTOS</span></code>
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getnet*() functions.
See also <i>netdbtype.U</i> for probing for various netdb types.</p>
</li>
<li><a name="'d_getpagsz'"></a><b><code class="inline"><span class="w">d_getpagsz</span></code>
</b>
<p>From <i>d_getpagsz.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETPAGESIZE</span></code>
if getpagesize()
is available to get the system page size.</p>
</li>
<li><a name="'d_getpbyname'"></a><b><code class="inline"><span class="w">d_getpbyname</span></code>
</b>
<p>From <i>d_getprotby.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPROTOBYNAME</span></code>
symbol, which indicates to the C program that the
getprotobyname() routine is available to look up protocols
by their name.</p>
</li>
<li><a name="'d_getpbynumber'"></a><b><code class="inline"><span class="w">d_getpbynumber</span></code>
</b>
<p>From <i>d_getprotby.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPROTOBYNUMBER</span></code>
symbol, which indicates to the C program that the
getprotobynumber() routine is available to look up protocols
by their number.</p>
</li>
<li><a name="'d_getpent'"></a><b><code class="inline"><span class="w">d_getpent</span></code>
</b>
<p>From <i>d_getpent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETPROTOENT</span></code>
if getprotoent() is
available to look up protocols in some data base or another.</p>
</li>
<li><a name="'d_getpgid'"></a><b><code class="inline"><span class="w">d_getpgid</span></code>
</b>
<p>From <i>d_getpgid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPGID</span></code>
symbol, which
indicates to the C program that the getpgid(pid) function
is available to get the process group id.</p>
</li>
<li><a name="'d_getpgrp'"></a><b><code class="inline"><span class="w">d_getpgrp</span></code>
</b>
<p>From <i>d_getpgrp.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETPGRP</span></code>
if getpgrp() is
available to get the current process group.</p>
</li>
<li><a name="'d_getpgrp2'"></a><b><code class="inline"><span class="w">d_getpgrp2</span></code>
</b>
<p>From <i>d_getpgrp2.U</i>:</p>
<p>This variable conditionally defines the HAS_GETPGRP2 symbol, which
indicates to the C program that the getpgrp2() (as in <i>DG/<code class="inline"><span class="w">UX</span></code>
</i>) routine
is available to get the current process group.</p>
</li>
<li><a name="'d_getppid'"></a><b><code class="inline"><span class="w">d_getppid</span></code>
</b>
<p>From <i>d_getppid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPPID</span></code>
symbol, which
indicates to the C program that the getppid() routine is available
to get the parent process <code class="inline"><span class="w">ID</span></code>
.</p>
</li>
<li><a name="'d_getprior'"></a><b><code class="inline"><span class="w">d_getprior</span></code>
</b>
<p>From <i>d_getprior.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETPRIORITY</span></code>
if getpriority()
is available to get a process's priority.</p>
</li>
<li><a name="'d_getprotobyname_r'"></a><b><code class="inline"><span class="w">d_getprotobyname_r</span></code>
</b>
<p>From <i>d_getprotobyname_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPROTOBYNAME_R</span></code>
symbol,
which indicates to the C program that the getprotobyname_r()
routine is available.</p>
</li>
<li><a name="'d_getprotobynumber_r'"></a><b><code class="inline"><span class="w">d_getprotobynumber_r</span></code>
</b>
<p>From <i>d_getprotobynumber_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPROTOBYNUMBER_R</span></code>
symbol,
which indicates to the C program that the getprotobynumber_r()
routine is available.</p>
</li>
<li><a name="'d_getprotoent_r'"></a><b><code class="inline"><span class="w">d_getprotoent_r</span></code>
</b>
<p>From <i>d_getprotoent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPROTOENT_R</span></code>
symbol,
which indicates to the C program that the getprotoent_r()
routine is available.</p>
</li>
<li><a name="'d_getprotoprotos'"></a><b><code class="inline"><span class="w">d_getprotoprotos</span></code>
</b>
<p>From <i>d_getprotoprotos.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPROTO_PROTOS</span></code>
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getproto*() functions.
See also <i>netdbtype.U</i> for probing for various netdb types.</p>
</li>
<li><a name="'d_getprpwnam'"></a><b><code class="inline"><span class="w">d_getprpwnam</span></code>
</b>
<p>From <i>d_getprpwnam.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETPRPWNAM</span></code>
if getprpwnam() is
available to retrieve protected (shadow) password entries by name.</p>
</li>
<li><a name="'d_getpwent'"></a><b><code class="inline"><span class="w">d_getpwent</span></code>
</b>
<p>From <i>d_getpwent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPWENT</span></code>
symbol, which
indicates to the C program that the getpwent() routine is available
for sequential access of the passwd database.</p>
</li>
<li><a name="'d_getpwent_r'"></a><b><code class="inline"><span class="w">d_getpwent_r</span></code>
</b>
<p>From <i>d_getpwent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPWENT_R</span></code>
symbol,
which indicates to the C program that the getpwent_r()
routine is available.</p>
</li>
<li><a name="'d_getpwnam_r'"></a><b><code class="inline"><span class="w">d_getpwnam_r</span></code>
</b>
<p>From <i>d_getpwnam_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPWNAM_R</span></code>
symbol,
which indicates to the C program that the getpwnam_r()
routine is available.</p>
</li>
<li><a name="'d_getpwuid_r'"></a><b><code class="inline"><span class="w">d_getpwuid_r</span></code>
</b>
<p>From <i>d_getpwuid_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETPWUID_R</span></code>
symbol,
which indicates to the C program that the getpwuid_r()
routine is available.</p>
</li>
<li><a name="'d_getsbyname'"></a><b><code class="inline"><span class="w">d_getsbyname</span></code>
</b>
<p>From <i>d_getsrvby.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSERVBYNAME</span></code>
symbol, which indicates to the C program that the
getservbyname() routine is available to look up services
by their name.</p>
</li>
<li><a name="'d_getsbyport'"></a><b><code class="inline"><span class="w">d_getsbyport</span></code>
</b>
<p>From <i>d_getsrvby.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSERVBYPORT</span></code>
symbol, which indicates to the C program that the
getservbyport() routine is available to look up services
by their port.</p>
</li>
<li><a name="'d_getsent'"></a><b><code class="inline"><span class="w">d_getsent</span></code>
</b>
<p>From <i>d_getsent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETSERVENT</span></code>
if getservent() is
available to look up network services in some data base or another.</p>
</li>
<li><a name="'d_getservbyname_r'"></a><b><code class="inline"><span class="w">d_getservbyname_r</span></code>
</b>
<p>From <i>d_getservbyname_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSERVBYNAME_R</span></code>
symbol,
which indicates to the C program that the getservbyname_r()
routine is available.</p>
</li>
<li><a name="'d_getservbyport_r'"></a><b><code class="inline"><span class="w">d_getservbyport_r</span></code>
</b>
<p>From <i>d_getservbyport_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSERVBYPORT_R</span></code>
symbol,
which indicates to the C program that the getservbyport_r()
routine is available.</p>
</li>
<li><a name="'d_getservent_r'"></a><b><code class="inline"><span class="w">d_getservent_r</span></code>
</b>
<p>From <i>d_getservent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSERVENT_R</span></code>
symbol,
which indicates to the C program that the getservent_r()
routine is available.</p>
</li>
<li><a name="'d_getservprotos'"></a><b><code class="inline"><span class="w">d_getservprotos</span></code>
</b>
<p>From <i>d_getservprotos.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSERV_PROTOS</span></code>
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getserv*() functions.
See also <i>netdbtype.U</i> for probing for various netdb types.</p>
</li>
<li><a name="'d_getspnam'"></a><b><code class="inline"><span class="w">d_getspnam</span></code>
</b>
<p>From <i>d_getspnam.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_GETSPNAM</span></code>
if getspnam() is
available to retrieve SysV shadow password entries by name.</p>
</li>
<li><a name="'d_getspnam_r'"></a><b><code class="inline"><span class="w">d_getspnam_r</span></code>
</b>
<p>From <i>d_getspnam_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETSPNAM_R</span></code>
symbol,
which indicates to the C program that the getspnam_r()
routine is available.</p>
</li>
<li><a name="'d_gettimeod'"></a><b><code class="inline"><span class="w">d_gettimeod</span></code>
</b>
<p>From <i>d_ftime.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GETTIMEOFDAY</span></code>
symbol, which
indicates that the gettimeofday() system call exists (to obtain a
sub-second accuracy clock). You should probably include <sys/resource.h>.</p>
</li>
<li><a name="'d_gmtime_r'"></a><b><code class="inline"><span class="w">d_gmtime_r</span></code>
</b>
<p>From <i>d_gmtime_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_GMTIME_R</span></code>
symbol,
which indicates to the C program that the gmtime_r()
routine is available.</p>
</li>
<li><a name="'d_gnulibc'"></a><b><code class="inline"><span class="w">d_gnulibc</span></code>
</b>
<p>From <i>d_gnulibc.U</i>:</p>
<p>Defined if we're dealing with the <code class="inline"><span class="w">GNU</span></code>
C Library.</p>
</li>
<li><a name="'d_grpasswd'"></a><b><code class="inline"><span class="w">d_grpasswd</span></code>
</b>
<p>From <i>i_grp.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">GRPASSWD</span></code>
, which indicates
that struct group in <grp.h> contains gr_passwd.</p>
</li>
<li><a name="'d_hasmntopt'"></a><b><code class="inline"><span class="w">d_hasmntopt</span></code>
</b>
<p>From <i>d_hasmntopt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_HASMNTOPT</span></code>
symbol, which
indicates to the C program that the hasmntopt() routine is available
to query the mount options of file systems.</p>
</li>
<li><a name="'d_htonl'"></a><b><code class="inline"><span class="w">d_htonl</span></code>
</b>
<p>From <i>d_htonl.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_HTONL</span></code>
if htonl() and its
friends are available to do network order byte swapping.</p>
</li>
<li><a name="'d_ilogbl'"></a><b><code class="inline"><span class="w">d_ilogbl</span></code>
</b>
<p>From <i>d_ilogbl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ILOGBL</span></code>
symbol, which
indicates to the C program that the ilogbl() routine is available.
If scalbnl is also present we can emulate frexpl.</p>
</li>
<li><a name="'d_inc_version_list'"></a><b><code class="inline"><span class="w">d_inc_version_list</span></code>
</b>
<p>From <i>inc_version_list.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PERL_INC_VERSION_LIST</span></code>
.
It is set to undef when <code class="inline"><span class="w">PERL_INC_VERSION_LIST</span></code>
is empty.</p>
</li>
<li><a name="'d_index'"></a><b><code class="inline"><span class="w">d_index</span></code>
</b>
<p>From <i>d_strchr.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_INDEX</span></code>
if index() and
rindex() are available for string searching.</p>
</li>
<li><a name="'d_inetaton'"></a><b><code class="inline"><span class="w">d_inetaton</span></code>
</b>
<p>From <i>d_inetaton.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_INET_ATON</span></code>
symbol, which
indicates to the C program that the inet_aton() function is available
to parse <code class="inline"><span class="w">IP</span></code>
address <code class="inline"><span class="w">dotted</span>-<span class="w">quad</span></code>
strings.</p>
</li>
<li><a name="'d_int64_t'"></a><b><code class="inline"><span class="w">d_int64_t</span></code>
</b>
<p>From <i>d_int64_t.U</i>:</p>
<p>This symbol will be defined if the C compiler supports int64_t.</p>
</li>
<li><a name="'d_isascii'"></a><b><code class="inline"><span class="w">d_isascii</span></code>
</b>
<p>From <i>d_isascii.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ISASCII</span></code>
constant,
which indicates to the C program that isascii() is available.</p>
</li>
<li><a name="'d_isfinite'"></a><b><code class="inline"><span class="w">d_isfinite</span></code>
</b>
<p>From <i>d_isfinite.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ISFINITE</span></code>
symbol, which
indicates to the C program that the isfinite() routine is available.</p>
</li>
<li><a name="'d_isinf'"></a><b><code class="inline"><span class="w">d_isinf</span></code>
</b>
<p>From <i>d_isinf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ISINF</span></code>
symbol, which
indicates to the C program that the isinf() routine is available.</p>
</li>
<li><a name="'d_isnan'"></a><b><code class="inline"><span class="w">d_isnan</span></code>
</b>
<p>From <i>d_isnan.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ISNAN</span></code>
symbol, which
indicates to the C program that the isnan() routine is available.</p>
</li>
<li><a name="'d_isnanl'"></a><b><code class="inline"><span class="w">d_isnanl</span></code>
</b>
<p>From <i>d_isnanl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_ISNANL</span></code>
symbol, which
indicates to the C program that the isnanl() routine is available.</p>
</li>
<li><a name="'d_killpg'"></a><b><code class="inline"><span class="w">d_killpg</span></code>
</b>
<p>From <i>d_killpg.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_KILLPG</span></code>
symbol, which
indicates to the C program that the killpg() routine is available
to kill process groups.</p>
</li>
<li><a name="'d_lchown'"></a><b><code class="inline"><span class="w">d_lchown</span></code>
</b>
<p>From <i>d_lchown.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_LCHOWN</span></code>
symbol, which
indicates to the C program that the lchown() routine is available
to operate on a symbolic link (instead of following the link).</p>
</li>
<li><a name="'d_ldbl_dig'"></a><b><code class="inline"><span class="w">d_ldbl_dig</span></code>
</b>
<p>From <i>d_ldbl_dig.U</i>:</p>
<p>This variable conditionally defines d_ldbl_dig if this system's
header files provide <code class="inline"><span class="w">LDBL_DIG</span></code>
, which is the number of significant
digits in a long double precision number.</p>
</li>
<li><a name="'d_libm_lib_version'"></a><b><code class="inline"><span class="w">d_libm_lib_version</span></code>
</b>
<p>From <i>d_libm_lib_version.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">LIBM_LIB_VERSION</span></code>
symbol,
which indicates to the C program that <i>math.h</i> defines <code class="inline"><span class="w">_LIB_VERSION</span></code>
being available in libm</p>
</li>
<li><a name="'d_link'"></a><b><code class="inline"><span class="w">d_link</span></code>
</b>
<p>From <i>d_link.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_LINK</span></code>
if link() is
available to create hard links.</p>
</li>
<li><a name="'d_localtime_r'"></a><b><code class="inline"><span class="w">d_localtime_r</span></code>
</b>
<p>From <i>d_localtime_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_LOCALTIME_R</span></code>
symbol,
which indicates to the C program that the localtime_r()
routine is available.</p>
</li>
<li><a name="'d_localtime_r_needs_tzset'"></a><b><code class="inline"><span class="w">d_localtime_r_needs_tzset</span></code>
</b>
<p>From <i>d_localtime_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">LOCALTIME_R_NEEDS_TZSET</span></code>
symbol, which makes us call tzset before localtime_r()</p>
</li>
<li><a name="'d_locconv'"></a><b><code class="inline"><span class="w">d_locconv</span></code>
</b>
<p>From <i>d_locconv.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_LOCALECONV</span></code>
if localeconv() is
available for numeric and monetary formatting conventions.</p>
</li>
<li><a name="'d_lockf'"></a><b><code class="inline"><span class="w">d_lockf</span></code>
</b>
<p>From <i>d_lockf.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_LOCKF</span></code>
if lockf() is
available to do file locking.</p>
</li>
<li><a name="'d_longdbl'"></a><b><code class="inline"><span class="w">d_longdbl</span></code>
</b>
<p>From <i>d_longdbl.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_LONG_DOUBLE</span></code>
if
the long double type is supported.</p>
</li>
<li><a name="'d_longlong'"></a><b><code class="inline"><span class="w">d_longlong</span></code>
</b>
<p>From <i>d_longlong.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_LONG_LONG</span></code>
if
the long long type is supported.</p>
</li>
<li><a name="'d_lseekproto'"></a><b><code class="inline"><span class="w">d_lseekproto</span></code>
</b>
<p>From <i>d_lseekproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_LSEEK_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the lseek() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_lstat'"></a><b><code class="inline"><span class="w">d_lstat</span></code>
</b>
<p>From <i>d_lstat.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_LSTAT</span></code>
if lstat() is
available to do file stats on symbolic links.</p>
</li>
<li><a name="'d_madvise'"></a><b><code class="inline"><span class="w">d_madvise</span></code>
</b>
<p>From <i>d_madvise.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_MADVISE</span></code>
if madvise() is
available to map a file into memory.</p>
</li>
<li><a name="'d_malloc_good_size'"></a><b><code class="inline"><span class="w">d_malloc_good_size</span></code>
</b>
<p>From <i>d_malloc_size.U</i>:</p>
<p>This symbol, if defined, indicates that the malloc_good_size
routine is available for use.</p>
</li>
<li><a name="'d_malloc_size'"></a><b><code class="inline"><span class="w">d_malloc_size</span></code>
</b>
<p>From <i>d_malloc_size.U</i>:</p>
<p>This symbol, if defined, indicates that the malloc_size
routine is available for use.</p>
</li>
<li><a name="'d_mblen'"></a><b><code class="inline"><span class="w">d_mblen</span></code>
</b>
<p>From <i>d_mblen.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MBLEN</span></code>
symbol, which
indicates to the C program that the mblen() routine is available
to find the number of bytes in a multibye character.</p>
</li>
<li><a name="'d_mbstowcs'"></a><b><code class="inline"><span class="w">d_mbstowcs</span></code>
</b>
<p>From <i>d_mbstowcs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MBSTOWCS</span></code>
symbol, which
indicates to the C program that the mbstowcs() routine is available
to convert a multibyte string into a wide character string.</p>
</li>
<li><a name="'d_mbtowc'"></a><b><code class="inline"><span class="w">d_mbtowc</span></code>
</b>
<p>From <i>d_mbtowc.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MBTOWC</span></code>
symbol, which
indicates to the C program that the mbtowc() routine is available
to convert multibyte to a wide character.</p>
</li>
<li><a name="'d_memchr'"></a><b><code class="inline"><span class="w">d_memchr</span></code>
</b>
<p>From <i>d_memchr.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MEMCHR</span></code>
symbol, which
indicates to the C program that the memchr() routine is available
to locate characters within a C string.</p>
</li>
<li><a name="'d_memcmp'"></a><b><code class="inline"><span class="w">d_memcmp</span></code>
</b>
<p>From <i>d_memcmp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MEMCMP</span></code>
symbol, which
indicates to the C program that the memcmp() routine is available
to compare blocks of memory.</p>
</li>
<li><a name="'d_memcpy'"></a><b><code class="inline"><span class="w">d_memcpy</span></code>
</b>
<p>From <i>d_memcpy.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MEMCPY</span></code>
symbol, which
indicates to the C program that the memcpy() routine is available
to copy blocks of memory.</p>
</li>
<li><a name="'d_memmove'"></a><b><code class="inline"><span class="w">d_memmove</span></code>
</b>
<p>From <i>d_memmove.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MEMMOVE</span></code>
symbol, which
indicates to the C program that the memmove() routine is available
to copy potentatially overlapping blocks of memory.</p>
</li>
<li><a name="'d_memset'"></a><b><code class="inline"><span class="w">d_memset</span></code>
</b>
<p>From <i>d_memset.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MEMSET</span></code>
symbol, which
indicates to the C program that the memset() routine is available
to set blocks of memory.</p>
</li>
<li><a name="'d_mkdir'"></a><b><code class="inline"><span class="w">d_mkdir</span></code>
</b>
<p>From <i>d_mkdir.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MKDIR</span></code>
symbol, which
indicates to the C program that the mkdir() routine is available
to create <i>directories.</i>.</p>
</li>
<li><a name="'d_mkdtemp'"></a><b><code class="inline"><span class="w">d_mkdtemp</span></code>
</b>
<p>From <i>d_mkdtemp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MKDTEMP</span></code>
symbol, which
indicates to the C program that the mkdtemp() routine is available
to exclusively create a uniquely named temporary directory.</p>
</li>
<li><a name="'d_mkfifo'"></a><b><code class="inline"><span class="w">d_mkfifo</span></code>
</b>
<p>From <i>d_mkfifo.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MKFIFO</span></code>
symbol, which
indicates to the C program that the mkfifo() routine is available.</p>
</li>
<li><a name="'d_mkstemp'"></a><b><code class="inline"><span class="w">d_mkstemp</span></code>
</b>
<p>From <i>d_mkstemp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MKSTEMP</span></code>
symbol, which
indicates to the C program that the mkstemp() routine is available
to exclusively create and open a uniquely named temporary file.</p>
</li>
<li><a name="'d_mkstemps'"></a><b><code class="inline"><span class="w">d_mkstemps</span></code>
</b>
<p>From <i>d_mkstemps.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MKSTEMPS</span></code>
symbol, which
indicates to the C program that the mkstemps() routine is available
to exclusively create and open a uniquely named (with a suffix)
temporary file.</p>
</li>
<li><a name="'d_mktime'"></a><b><code class="inline"><span class="w">d_mktime</span></code>
</b>
<p>From <i>d_mktime.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MKTIME</span></code>
symbol, which
indicates to the C program that the mktime() routine is available.</p>
</li>
<li><a name="'d_mmap'"></a><b><code class="inline"><span class="w">d_mmap</span></code>
</b>
<p>From <i>d_mmap.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_MMAP</span></code>
if mmap() is
available to map a file into memory.</p>
</li>
<li><a name="'d_modfl'"></a><b><code class="inline"><span class="w">d_modfl</span></code>
</b>
<p>From <i>d_modfl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MODFL</span></code>
symbol, which
indicates to the C program that the modfl() routine is available.</p>
</li>
<li><a name="'d_modfl_pow32_bug'"></a><b><code class="inline"><span class="w">d_modfl_pow32_bug</span></code>
</b>
<p>From <i>d_modfl.U</i>:</p>
<p>This variable conditionally defines the HAS_MODFL_POW32_BUG symbol,
which indicates that modfl() is broken for long doubles >= pow(2, 32).
For example from 4294967303.150000 one would get 4294967302.000000
and 1.150000. The bug has been seen in certain versions of glibc,
release 2.2.2 is known to be okay.</p>
</li>
<li><a name="'d_modflproto'"></a><b><code class="inline"><span class="w">d_modflproto</span></code>
</b>
<p>From <i>d_modfl.U</i>:</p>
<p>This symbol, if defined, indicates that the system provides
a prototype for the modfl() function. Otherwise, it is up
to the program to supply one. C99 says it should be
long double modfl(long double, long double *);</p>
</li>
<li><a name="'d_mprotect'"></a><b><code class="inline"><span class="w">d_mprotect</span></code>
</b>
<p>From <i>d_mprotect.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_MPROTECT</span></code>
if mprotect() is
available to modify the access protection of a memory mapped file.</p>
</li>
<li><a name="'d_msg'"></a><b><code class="inline"><span class="w">d_msg</span></code>
</b>
<p>From <i>d_msg.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSG</span></code>
symbol, which
indicates that the entire msg*(2) library is present.</p>
</li>
<li><a name="'d_msg_ctrunc'"></a><b><code class="inline"><span class="w">d_msg_ctrunc</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSG_CTRUNC</span></code>
symbol,
which indicates that the <code class="inline"><span class="w">MSG_CTRUNC</span></code>
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.</p>
</li>
<li><a name="'d_msg_dontroute'"></a><b><code class="inline"><span class="w">d_msg_dontroute</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSG_DONTROUTE</span></code>
symbol,
which indicates that the <code class="inline"><span class="w">MSG_DONTROUTE</span></code>
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.</p>
</li>
<li><a name="'d_msg_oob'"></a><b><code class="inline"><span class="w">d_msg_oob</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSG_OOB</span></code>
symbol,
which indicates that the <code class="inline"><span class="w">MSG_OOB</span></code>
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.</p>
</li>
<li><a name="'d_msg_peek'"></a><b><code class="inline"><span class="w">d_msg_peek</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSG_PEEK</span></code>
symbol,
which indicates that the <code class="inline"><span class="w">MSG_PEEK</span></code>
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.</p>
</li>
<li><a name="'d_msg_proxy'"></a><b><code class="inline"><span class="w">d_msg_proxy</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSG_PROXY</span></code>
symbol,
which indicates that the <code class="inline"><span class="w">MSG_PROXY</span></code>
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.</p>
</li>
<li><a name="'d_msgctl'"></a><b><code class="inline"><span class="w">d_msgctl</span></code>
</b>
<p>From <i>d_msgctl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSGCTL</span></code>
symbol, which
indicates to the C program that the msgctl() routine is available.</p>
</li>
<li><a name="'d_msgget'"></a><b><code class="inline"><span class="w">d_msgget</span></code>
</b>
<p>From <i>d_msgget.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSGGET</span></code>
symbol, which
indicates to the C program that the msgget() routine is available.</p>
</li>
<li><a name="'d_msghdr_s'"></a><b><code class="inline"><span class="w">d_msghdr_s</span></code>
</b>
<p>From <i>d_msghdr_s.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRUCT_MSGHDR</span></code>
symbol,
which indicates that the struct msghdr is supported.</p>
</li>
<li><a name="'d_msgrcv'"></a><b><code class="inline"><span class="w">d_msgrcv</span></code>
</b>
<p>From <i>d_msgrcv.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSGRCV</span></code>
symbol, which
indicates to the C program that the msgrcv() routine is available.</p>
</li>
<li><a name="'d_msgsnd'"></a><b><code class="inline"><span class="w">d_msgsnd</span></code>
</b>
<p>From <i>d_msgsnd.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_MSGSND</span></code>
symbol, which
indicates to the C program that the msgsnd() routine is available.</p>
</li>
<li><a name="'d_msync'"></a><b><code class="inline"><span class="w">d_msync</span></code>
</b>
<p>From <i>d_msync.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_MSYNC</span></code>
if msync() is
available to synchronize a mapped file.</p>
</li>
<li><a name="'d_munmap'"></a><b><code class="inline"><span class="w">d_munmap</span></code>
</b>
<p>From <i>d_munmap.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_MUNMAP</span></code>
if munmap() is
available to unmap a region mapped by mmap().</p>
</li>
<li><a name="'d_mymalloc'"></a><b><code class="inline"><span class="w">d_mymalloc</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">MYMALLOC</span></code>
in case other parts
of the source want to take special action if <code class="inline"><span class="w">MYMALLOC</span></code>
is used.
This may include different sorts of profiling or error detection.</p>
</li>
<li><a name="'d_nice'"></a><b><code class="inline"><span class="w">d_nice</span></code>
</b>
<p>From <i>d_nice.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_NICE</span></code>
symbol, which
indicates to the C program that the nice() routine is available.</p>
</li>
<li><a name="'d_nl_langinfo'"></a><b><code class="inline"><span class="w">d_nl_langinfo</span></code>
</b>
<p>From <i>d_nl_langinfo.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_NL_LANGINFO</span></code>
symbol, which
indicates to the C program that the nl_langinfo() routine is available.</p>
</li>
<li><a name="'d_nv_preserves_uv'"></a><b><code class="inline"><span class="w">d_nv_preserves_uv</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable indicates whether a variable of type nvtype
can preserve all the bits a variable of type uvtype.</p>
</li>
<li><a name="'d_nv_zero_is_allbits_zero'"></a><b><code class="inline"><span class="w">d_nv_zero_is_allbits_zero</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable indicates whether a variable of type nvtype
stores 0.0 in memory as all bits zero.</p>
</li>
<li><a name="'d_off64_t'"></a><b><code class="inline"><span class="w">d_off64_t</span></code>
</b>
<p>From <i>d_off64_t.U</i>:</p>
<p>This symbol will be defined if the C compiler supports off64_t.</p>
</li>
<li><a name="'d_old_pthread_create_joinable'"></a><b><code class="inline"><span class="w">d_old_pthread_create_joinable</span></code>
</b>
<p>From <i>d_pthrattrj.U</i>:</p>
<p>This variable conditionally defines pthread_create_joinable.
undef if <i>pthread.h</i> defines <code class="inline"><span class="w">PTHREAD_CREATE_JOINABLE</span></code>
.</p>
</li>
<li><a name="'d_oldpthreads'"></a><b><code class="inline"><span class="w">d_oldpthreads</span></code>
</b>
<p>From <i>usethreads.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">OLD_PTHREADS_API</span></code>
symbol,
and indicates that Perl should be built to use the old
draft <code class="inline"><span class="w">POSIX</span></code>
threads <code class="inline"><span class="w">API</span></code>
. This is only potentially meaningful if
usethreads is set.</p>
</li>
<li><a name="'d_oldsock'"></a><b><code class="inline"><span class="w">d_oldsock</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">OLDSOCKET</span></code>
symbol, which
indicates that the <code class="inline"><span class="w">BSD</span></code>
socket interface is based on 4.1c and not 4.2.</p>
</li>
<li><a name="'d_open3'"></a><b><code class="inline"><span class="w">d_open3</span></code>
</b>
<p>From <i>d_open3.U</i>:</p>
<p>This variable conditionally defines the HAS_OPEN3 manifest constant,
which indicates to the C program that the 3 argument version of
the open(2) function is available.</p>
</li>
<li><a name="'d_pathconf'"></a><b><code class="inline"><span class="w">d_pathconf</span></code>
</b>
<p>From <i>d_pathconf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PATHCONF</span></code>
symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given filename.</p>
</li>
<li><a name="'d_pause'"></a><b><code class="inline"><span class="w">d_pause</span></code>
</b>
<p>From <i>d_pause.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PAUSE</span></code>
symbol, which
indicates to the C program that the pause() routine is available
to suspend a process until a signal is received.</p>
</li>
<li><a name="'d_perl_otherlibdirs'"></a><b><code class="inline"><span class="w">d_perl_otherlibdirs</span></code>
</b>
<p>From <i>otherlibdirs.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PERL_OTHERLIBDIRS</span></code>
, which
contains a colon-separated set of paths for the perl binary to
include in @<code class="inline"><span class="w">INC</span></code>
. See also otherlibdirs.</p>
</li>
<li><a name="'d_phostname'"></a><b><code class="inline"><span class="w">d_phostname</span></code>
</b>
<p>From <i>d_gethname.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PHOSTNAME</span></code>
symbol, which
contains the shell command which, when fed to popen(), may be
used to derive the host name.</p>
</li>
<li><a name="'d_pipe'"></a><b><code class="inline"><span class="w">d_pipe</span></code>
</b>
<p>From <i>d_pipe.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PIPE</span></code>
symbol, which
indicates to the C program that the pipe() routine is available
to create an inter-process channel.</p>
</li>
<li><a name="'d_poll'"></a><b><code class="inline"><span class="w">d_poll</span></code>
</b>
<p>From <i>d_poll.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_POLL</span></code>
symbol, which
indicates to the C program that the poll() routine is available
to poll active file descriptors.</p>
</li>
<li><a name="'d_portable'"></a><b><code class="inline"><span class="w">d_portable</span></code>
</b>
<p>From <i>d_portable.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">PORTABLE</span></code>
symbol, which
indicates to the C program that it should not assume that it is
running on the machine it was compiled on.</p>
</li>
<li><a name="'d_PRId64'"></a><b><code class="inline"><span class="w">d_PRId64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRId64 symbol, which
indiciates that stdio has a symbol to print 64-bit decimal numbers.</p>
</li>
<li><a name="'d_PRIeldbl'"></a><b><code class="inline"><span class="w">d_PRIeldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.</p>
</li>
<li><a name="'d_PRIEUldbl'"></a><b><code class="inline"><span class="w">d_PRIEUldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from d_PRIeldbl so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'d_PRIfldbl'"></a><b><code class="inline"><span class="w">d_PRIfldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.</p>
</li>
<li><a name="'d_PRIFUldbl'"></a><b><code class="inline"><span class="w">d_PRIFUldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from d_PRIfldbl so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'d_PRIgldbl'"></a><b><code class="inline"><span class="w">d_PRIgldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.</p>
</li>
<li><a name="'d_PRIGUldbl'"></a><b><code class="inline"><span class="w">d_PRIGUldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from d_PRIgldbl so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'d_PRIi64'"></a><b><code class="inline"><span class="w">d_PRIi64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIi64 symbol, which
indiciates that stdio has a symbol to print 64-bit decimal numbers.</p>
</li>
<li><a name="'d_printf_format_null'"></a><b><code class="inline"><span class="w">d_printf_format_null</span></code>
</b>
<p>From <i>d_attribut.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PRINTF_FORMAT_NULL_OK</span></code>
, which
indicates the C compiler allows printf-like formats to be null.</p>
</li>
<li><a name="'d_PRIo64'"></a><b><code class="inline"><span class="w">d_PRIo64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIo64 symbol, which
indiciates that stdio has a symbol to print 64-bit octal numbers.</p>
</li>
<li><a name="'d_PRIu64'"></a><b><code class="inline"><span class="w">d_PRIu64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIu64 symbol, which
indiciates that stdio has a symbol to print 64-bit unsigned decimal
numbers.</p>
</li>
<li><a name="'d_PRIx64'"></a><b><code class="inline"><span class="w">d_PRIx64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIx64 symbol, which
indiciates that stdio has a symbol to print 64-bit hexadecimal numbers.</p>
</li>
<li><a name="'d_PRIXU64'"></a><b><code class="inline"><span class="w">d_PRIXU64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIXU64 symbol, which
indiciates that stdio has a symbol to print 64-bit hExADECimAl numbers.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from d_PRIx64 so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'d_procselfexe'"></a><b><code class="inline"><span class="w">d_procselfexe</span></code>
</b>
<p>From <i>d_procselfexe.U</i>:</p>
<p>Defined if $procselfexe is symlink to the absolute
pathname of the executing program.</p>
</li>
<li><a name="'d_pseudofork'"></a><b><code class="inline"><span class="w">d_pseudofork</span></code>
</b>
<p>From <i>d_vfork.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PSEUDOFORK</span></code>
symbol,
which indicates that an emulation of the fork routine is available.</p>
</li>
<li><a name="'d_pthread_atfork'"></a><b><code class="inline"><span class="w">d_pthread_atfork</span></code>
</b>
<p>From <i>d_pthread_atfork.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PTHREAD_ATFORK</span></code>
symbol,
which indicates to the C program that the pthread_atfork()
routine is available.</p>
</li>
<li><a name="'d_pthread_attr_setscope'"></a><b><code class="inline"><span class="w">d_pthread_attr_setscope</span></code>
</b>
<p>From <i>d_pthread_attr_ss.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_PTHREAD_ATTR_SETSCOPE</span></code>
if
pthread_attr_setscope() is available to set the contention scope
attribute of a thread attribute object.</p>
</li>
<li><a name="'d_pthread_yield'"></a><b><code class="inline"><span class="w">d_pthread_yield</span></code>
</b>
<p>From <i>d_pthread_y.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_PTHREAD_YIELD</span></code>
symbol if the pthread_yield routine is available to yield
the execution of the current thread.</p>
</li>
<li><a name="'d_pwage'"></a><b><code class="inline"><span class="w">d_pwage</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWAGE</span></code>
, which indicates
that struct passwd contains pw_age.</p>
</li>
<li><a name="'d_pwchange'"></a><b><code class="inline"><span class="w">d_pwchange</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWCHANGE</span></code>
, which indicates
that struct passwd contains pw_change.</p>
</li>
<li><a name="'d_pwclass'"></a><b><code class="inline"><span class="w">d_pwclass</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWCLASS</span></code>
, which indicates
that struct passwd contains pw_class.</p>
</li>
<li><a name="'d_pwcomment'"></a><b><code class="inline"><span class="w">d_pwcomment</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWCOMMENT</span></code>
, which indicates
that struct passwd contains pw_comment.</p>
</li>
<li><a name="'d_pwexpire'"></a><b><code class="inline"><span class="w">d_pwexpire</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWEXPIRE</span></code>
, which indicates
that struct passwd contains pw_expire.</p>
</li>
<li><a name="'d_pwgecos'"></a><b><code class="inline"><span class="w">d_pwgecos</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWGECOS</span></code>
, which indicates
that struct passwd contains pw_gecos.</p>
</li>
<li><a name="'d_pwpasswd'"></a><b><code class="inline"><span class="w">d_pwpasswd</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWPASSWD</span></code>
, which indicates
that struct passwd contains pw_passwd.</p>
</li>
<li><a name="'d_pwquota'"></a><b><code class="inline"><span class="w">d_pwquota</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PWQUOTA</span></code>
, which indicates
that struct passwd contains pw_quota.</p>
</li>
<li><a name="'d_qgcvt'"></a><b><code class="inline"><span class="w">d_qgcvt</span></code>
</b>
<p>From <i>d_qgcvt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_QGCVT</span></code>
symbol, which
indicates to the C program that the qgcvt() routine is available.</p>
</li>
<li><a name="'d_quad'"></a><b><code class="inline"><span class="w">d_quad</span></code>
</b>
<p>From <i>quadtype.U</i>:</p>
<p>This variable, if defined, tells that there's a 64-bit integer type,
quadtype.</p>
</li>
<li><a name="'d_random_r'"></a><b><code class="inline"><span class="w">d_random_r</span></code>
</b>
<p>From <i>d_random_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_RANDOM_R</span></code>
symbol,
which indicates to the C program that the random_r()
routine is available.</p>
</li>
<li><a name="'d_readdir'"></a><b><code class="inline"><span class="w">d_readdir</span></code>
</b>
<p>From <i>d_readdir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_READDIR</span></code>
if readdir() is
available to read directory entries.</p>
</li>
<li><a name="'d_readdir64_r'"></a><b><code class="inline"><span class="w">d_readdir64_r</span></code>
</b>
<p>From <i>d_readdir64_r.U</i>:</p>
<p>This variable conditionally defines the HAS_READDIR64_R symbol,
which indicates to the C program that the readdir64_r()
routine is available.</p>
</li>
<li><a name="'d_readdir_r'"></a><b><code class="inline"><span class="w">d_readdir_r</span></code>
</b>
<p>From <i>d_readdir_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_READDIR_R</span></code>
symbol,
which indicates to the C program that the readdir_r()
routine is available.</p>
</li>
<li><a name="'d_readlink'"></a><b><code class="inline"><span class="w">d_readlink</span></code>
</b>
<p>From <i>d_readlink.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_READLINK</span></code>
symbol, which
indicates to the C program that the readlink() routine is available
to read the value of a symbolic link.</p>
</li>
<li><a name="'d_readv'"></a><b><code class="inline"><span class="w">d_readv</span></code>
</b>
<p>From <i>d_readv.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_READV</span></code>
symbol, which
indicates to the C program that the readv() routine is available.</p>
</li>
<li><a name="'d_recvmsg'"></a><b><code class="inline"><span class="w">d_recvmsg</span></code>
</b>
<p>From <i>d_recvmsg.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_RECVMSG</span></code>
symbol, which
indicates to the C program that the recvmsg() routine is available.</p>
</li>
<li><a name="'d_rename'"></a><b><code class="inline"><span class="w">d_rename</span></code>
</b>
<p>From <i>d_rename.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_RENAME</span></code>
symbol, which
indicates to the C program that the rename() routine is available
to rename files.</p>
</li>
<li><a name="'d_rewinddir'"></a><b><code class="inline"><span class="w">d_rewinddir</span></code>
</b>
<p>From <i>d_readdir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_REWINDDIR</span></code>
if rewinddir() is
available.</p>
</li>
<li><a name="'d_rmdir'"></a><b><code class="inline"><span class="w">d_rmdir</span></code>
</b>
<p>From <i>d_rmdir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_RMDIR</span></code>
if rmdir() is
available to remove directories.</p>
</li>
<li><a name="'d_safebcpy'"></a><b><code class="inline"><span class="w">d_safebcpy</span></code>
</b>
<p>From <i>d_safebcpy.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SAFE_BCOPY</span></code>
symbol if
the bcopy() routine can do overlapping copies. Normally, you
should probably use memmove().</p>
</li>
<li><a name="'d_safemcpy'"></a><b><code class="inline"><span class="w">d_safemcpy</span></code>
</b>
<p>From <i>d_safemcpy.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SAFE_MEMCPY</span></code>
symbol if
the memcpy() routine can do overlapping copies.
For overlapping copies, memmove() should be used, if available.</p>
</li>
<li><a name="'d_sanemcmp'"></a><b><code class="inline"><span class="w">d_sanemcmp</span></code>
</b>
<p>From <i>d_sanemcmp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SANE_MEMCMP</span></code>
symbol if
the memcpy() routine is available and can be used to compare relative
magnitudes of chars with their high bits set.</p>
</li>
<li><a name="'d_sbrkproto'"></a><b><code class="inline"><span class="w">d_sbrkproto</span></code>
</b>
<p>From <i>d_sbrkproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SBRK_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the sbrk() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_scalbnl'"></a><b><code class="inline"><span class="w">d_scalbnl</span></code>
</b>
<p>From <i>d_scalbnl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SCALBNL</span></code>
symbol, which
indicates to the C program that the scalbnl() routine is available.
If ilogbl is also present we can emulate frexpl.</p>
</li>
<li><a name="'d_sched_yield'"></a><b><code class="inline"><span class="w">d_sched_yield</span></code>
</b>
<p>From <i>d_pthread_y.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SCHED_YIELD</span></code>
symbol if the sched_yield routine is available to yield
the execution of the current thread.</p>
</li>
<li><a name="'d_scm_rights'"></a><b><code class="inline"><span class="w">d_scm_rights</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SCM_RIGHTS</span></code>
symbol,
which indicates that the <code class="inline"><span class="w">SCM_RIGHTS</span></code>
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.</p>
</li>
<li><a name="'d_SCNfldbl'"></a><b><code class="inline"><span class="w">d_SCNfldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to scan long doubles.</p>
</li>
<li><a name="'d_seekdir'"></a><b><code class="inline"><span class="w">d_seekdir</span></code>
</b>
<p>From <i>d_readdir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SEEKDIR</span></code>
if seekdir() is
available.</p>
</li>
<li><a name="'d_select'"></a><b><code class="inline"><span class="w">d_select</span></code>
</b>
<p>From <i>d_select.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SELECT</span></code>
if select() is
available to select active file descriptors. A <sys/time.h>
inclusion may be necessary for the timeout field.</p>
</li>
<li><a name="'d_sem'"></a><b><code class="inline"><span class="w">d_sem</span></code>
</b>
<p>From <i>d_sem.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SEM</span></code>
symbol, which
indicates that the entire sem*(2) library is present.</p>
</li>
<li><a name="'d_semctl'"></a><b><code class="inline"><span class="w">d_semctl</span></code>
</b>
<p>From <i>d_semctl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SEMCTL</span></code>
symbol, which
indicates to the C program that the semctl() routine is available.</p>
</li>
<li><a name="'d_semctl_semid_ds'"></a><b><code class="inline"><span class="w">d_semctl_semid_ds</span></code>
</b>
<p>From <i>d_union_semun.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_SEMCTL_SEMID_DS</span></code>
, which
indicates that struct semid_ds * is to be used for semctl <code class="inline"><span class="w">IPC_STAT</span></code>
.</p>
</li>
<li><a name="'d_semctl_semun'"></a><b><code class="inline"><span class="w">d_semctl_semun</span></code>
</b>
<p>From <i>d_union_semun.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_SEMCTL_SEMUN</span></code>
, which
indicates that union semun is to be used for semctl <code class="inline"><span class="w">IPC_STAT</span></code>
.</p>
</li>
<li><a name="'d_semget'"></a><b><code class="inline"><span class="w">d_semget</span></code>
</b>
<p>From <i>d_semget.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SEMGET</span></code>
symbol, which
indicates to the C program that the semget() routine is available.</p>
</li>
<li><a name="'d_semop'"></a><b><code class="inline"><span class="w">d_semop</span></code>
</b>
<p>From <i>d_semop.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SEMOP</span></code>
symbol, which
indicates to the C program that the semop() routine is available.</p>
</li>
<li><a name="'d_sendmsg'"></a><b><code class="inline"><span class="w">d_sendmsg</span></code>
</b>
<p>From <i>d_sendmsg.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SENDMSG</span></code>
symbol, which
indicates to the C program that the sendmsg() routine is available.</p>
</li>
<li><a name="'d_setegid'"></a><b><code class="inline"><span class="w">d_setegid</span></code>
</b>
<p>From <i>d_setegid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETEGID</span></code>
symbol, which
indicates to the C program that the setegid() routine is available
to change the effective gid of the current program.</p>
</li>
<li><a name="'d_seteuid'"></a><b><code class="inline"><span class="w">d_seteuid</span></code>
</b>
<p>From <i>d_seteuid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETEUID</span></code>
symbol, which
indicates to the C program that the seteuid() routine is available
to change the effective uid of the current program.</p>
</li>
<li><a name="'d_setgrent'"></a><b><code class="inline"><span class="w">d_setgrent</span></code>
</b>
<p>From <i>d_setgrent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETGRENT</span></code>
symbol, which
indicates to the C program that the setgrent() routine is available
for initializing sequential access to the group database.</p>
</li>
<li><a name="'d_setgrent_r'"></a><b><code class="inline"><span class="w">d_setgrent_r</span></code>
</b>
<p>From <i>d_setgrent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETGRENT_R</span></code>
symbol,
which indicates to the C program that the setgrent_r()
routine is available.</p>
</li>
<li><a name="'d_setgrps'"></a><b><code class="inline"><span class="w">d_setgrps</span></code>
</b>
<p>From <i>d_setgrps.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETGROUPS</span></code>
symbol, which
indicates to the C program that the setgroups() routine is available
to set the list of process groups.</p>
</li>
<li><a name="'d_sethent'"></a><b><code class="inline"><span class="w">d_sethent</span></code>
</b>
<p>From <i>d_sethent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETHOSTENT</span></code>
if sethostent() is
available.</p>
</li>
<li><a name="'d_sethostent_r'"></a><b><code class="inline"><span class="w">d_sethostent_r</span></code>
</b>
<p>From <i>d_sethostent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETHOSTENT_R</span></code>
symbol,
which indicates to the C program that the sethostent_r()
routine is available.</p>
</li>
<li><a name="'d_setitimer'"></a><b><code class="inline"><span class="w">d_setitimer</span></code>
</b>
<p>From <i>d_setitimer.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETITIMER</span></code>
symbol, which
indicates to the C program that the setitimer() routine is available.</p>
</li>
<li><a name="'d_setlinebuf'"></a><b><code class="inline"><span class="w">d_setlinebuf</span></code>
</b>
<p>From <i>d_setlnbuf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETLINEBUF</span></code>
symbol, which
indicates to the C program that the setlinebuf() routine is available
to change stderr or stdout from block-buffered or unbuffered to a
line-buffered mode.</p>
</li>
<li><a name="'d_setlocale'"></a><b><code class="inline"><span class="w">d_setlocale</span></code>
</b>
<p>From <i>d_setlocale.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETLOCALE</span></code>
if setlocale() is
available to handle locale-specific ctype implementations.</p>
</li>
<li><a name="'d_setlocale_r'"></a><b><code class="inline"><span class="w">d_setlocale_r</span></code>
</b>
<p>From <i>d_setlocale_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETLOCALE_R</span></code>
symbol,
which indicates to the C program that the setlocale_r()
routine is available.</p>
</li>
<li><a name="'d_setnent'"></a><b><code class="inline"><span class="w">d_setnent</span></code>
</b>
<p>From <i>d_setnent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETNETENT</span></code>
if setnetent() is
available.</p>
</li>
<li><a name="'d_setnetent_r'"></a><b><code class="inline"><span class="w">d_setnetent_r</span></code>
</b>
<p>From <i>d_setnetent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETNETENT_R</span></code>
symbol,
which indicates to the C program that the setnetent_r()
routine is available.</p>
</li>
<li><a name="'d_setpent'"></a><b><code class="inline"><span class="w">d_setpent</span></code>
</b>
<p>From <i>d_setpent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETPROTOENT</span></code>
if setprotoent() is
available.</p>
</li>
<li><a name="'d_setpgid'"></a><b><code class="inline"><span class="w">d_setpgid</span></code>
</b>
<p>From <i>d_setpgid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETPGID</span></code>
symbol if the
setpgid(pid, gpid) function is available to set process group <code class="inline"><span class="w">ID</span></code>
.</p>
</li>
<li><a name="'d_setpgrp'"></a><b><code class="inline"><span class="w">d_setpgrp</span></code>
</b>
<p>From <i>d_setpgrp.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETPGRP</span></code>
if setpgrp() is
available to set the current process group.</p>
</li>
<li><a name="'d_setpgrp2'"></a><b><code class="inline"><span class="w">d_setpgrp2</span></code>
</b>
<p>From <i>d_setpgrp2.U</i>:</p>
<p>This variable conditionally defines the HAS_SETPGRP2 symbol, which
indicates to the C program that the setpgrp2() (as in <i>DG/<code class="inline"><span class="w">UX</span></code>
</i>) routine
is available to set the current process group.</p>
</li>
<li><a name="'d_setprior'"></a><b><code class="inline"><span class="w">d_setprior</span></code>
</b>
<p>From <i>d_setprior.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETPRIORITY</span></code>
if setpriority()
is available to set a process's priority.</p>
</li>
<li><a name="'d_setproctitle'"></a><b><code class="inline"><span class="w">d_setproctitle</span></code>
</b>
<p>From <i>d_setproctitle.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETPROCTITLE</span></code>
symbol,
which indicates to the C program that the setproctitle() routine
is available.</p>
</li>
<li><a name="'d_setprotoent_r'"></a><b><code class="inline"><span class="w">d_setprotoent_r</span></code>
</b>
<p>From <i>d_setprotoent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETPROTOENT_R</span></code>
symbol,
which indicates to the C program that the setprotoent_r()
routine is available.</p>
</li>
<li><a name="'d_setpwent'"></a><b><code class="inline"><span class="w">d_setpwent</span></code>
</b>
<p>From <i>d_setpwent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETPWENT</span></code>
symbol, which
indicates to the C program that the setpwent() routine is available
for initializing sequential access to the passwd database.</p>
</li>
<li><a name="'d_setpwent_r'"></a><b><code class="inline"><span class="w">d_setpwent_r</span></code>
</b>
<p>From <i>d_setpwent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETPWENT_R</span></code>
symbol,
which indicates to the C program that the setpwent_r()
routine is available.</p>
</li>
<li><a name="'d_setregid'"></a><b><code class="inline"><span class="w">d_setregid</span></code>
</b>
<p>From <i>d_setregid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETREGID</span></code>
if setregid() is
available to change the real and effective gid of the current
process.</p>
</li>
<li><a name="'d_setresgid'"></a><b><code class="inline"><span class="w">d_setresgid</span></code>
</b>
<p>From <i>d_setregid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETRESGID</span></code>
if setresgid() is
available to change the real, effective and saved gid of the current
process.</p>
</li>
<li><a name="'d_setresuid'"></a><b><code class="inline"><span class="w">d_setresuid</span></code>
</b>
<p>From <i>d_setreuid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETREUID</span></code>
if setresuid() is
available to change the real, effective and saved uid of the current
process.</p>
</li>
<li><a name="'d_setreuid'"></a><b><code class="inline"><span class="w">d_setreuid</span></code>
</b>
<p>From <i>d_setreuid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETREUID</span></code>
if setreuid() is
available to change the real and effective uid of the current
process.</p>
</li>
<li><a name="'d_setrgid'"></a><b><code class="inline"><span class="w">d_setrgid</span></code>
</b>
<p>From <i>d_setrgid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETRGID</span></code>
symbol, which
indicates to the C program that the setrgid() routine is available
to change the real gid of the current program.</p>
</li>
<li><a name="'d_setruid'"></a><b><code class="inline"><span class="w">d_setruid</span></code>
</b>
<p>From <i>d_setruid.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETRUID</span></code>
symbol, which
indicates to the C program that the setruid() routine is available
to change the real uid of the current program.</p>
</li>
<li><a name="'d_setsent'"></a><b><code class="inline"><span class="w">d_setsent</span></code>
</b>
<p>From <i>d_setsent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETSERVENT</span></code>
if setservent() is
available.</p>
</li>
<li><a name="'d_setservent_r'"></a><b><code class="inline"><span class="w">d_setservent_r</span></code>
</b>
<p>From <i>d_setservent_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETSERVENT_R</span></code>
symbol,
which indicates to the C program that the setservent_r()
routine is available.</p>
</li>
<li><a name="'d_setsid'"></a><b><code class="inline"><span class="w">d_setsid</span></code>
</b>
<p>From <i>d_setsid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SETSID</span></code>
if setsid() is
available to set the process group <code class="inline"><span class="w">ID</span></code>
.</p>
</li>
<li><a name="'d_setvbuf'"></a><b><code class="inline"><span class="w">d_setvbuf</span></code>
</b>
<p>From <i>d_setvbuf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETVBUF</span></code>
symbol, which
indicates to the C program that the setvbuf() routine is available
to change buffering on an open stdio stream.</p>
</li>
<li><a name="'d_sfio'"></a><b><code class="inline"><span class="w">d_sfio</span></code>
</b>
<p>From <i>d_sfio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_SFIO</span></code>
symbol,
and indicates whether sfio is available (and should be used).</p>
</li>
<li><a name="'d_shm'"></a><b><code class="inline"><span class="w">d_shm</span></code>
</b>
<p>From <i>d_shm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SHM</span></code>
symbol, which
indicates that the entire shm*(2) library is present.</p>
</li>
<li><a name="'d_shmat'"></a><b><code class="inline"><span class="w">d_shmat</span></code>
</b>
<p>From <i>d_shmat.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SHMAT</span></code>
symbol, which
indicates to the C program that the shmat() routine is available.</p>
</li>
<li><a name="'d_shmatprototype'"></a><b><code class="inline"><span class="w">d_shmatprototype</span></code>
</b>
<p>From <i>d_shmat.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SHMAT_PROTOTYPE</span></code>
symbol, which indicates that <i>sys/shm.h</i> has a prototype for
shmat.</p>
</li>
<li><a name="'d_shmctl'"></a><b><code class="inline"><span class="w">d_shmctl</span></code>
</b>
<p>From <i>d_shmctl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SHMCTL</span></code>
symbol, which
indicates to the C program that the shmctl() routine is available.</p>
</li>
<li><a name="'d_shmdt'"></a><b><code class="inline"><span class="w">d_shmdt</span></code>
</b>
<p>From <i>d_shmdt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SHMDT</span></code>
symbol, which
indicates to the C program that the shmdt() routine is available.</p>
</li>
<li><a name="'d_shmget'"></a><b><code class="inline"><span class="w">d_shmget</span></code>
</b>
<p>From <i>d_shmget.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SHMGET</span></code>
symbol, which
indicates to the C program that the shmget() routine is available.</p>
</li>
<li><a name="'d_sigaction'"></a><b><code class="inline"><span class="w">d_sigaction</span></code>
</b>
<p>From <i>d_sigaction.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SIGACTION</span></code>
symbol, which
indicates that the Vr4 sigaction() routine is available.</p>
</li>
<li><a name="'d_signbit'"></a><b><code class="inline"><span class="w">d_signbit</span></code>
</b>
<p>From <i>d_signbit.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SIGNBIT</span></code>
symbol, which
indicates to the C program that the signbit() routine is available
and safe to use with perl's intern <code class="inline"><span class="w">NV</span></code>
type.</p>
</li>
<li><a name="'d_sigprocmask'"></a><b><code class="inline"><span class="w">d_sigprocmask</span></code>
</b>
<p>From <i>d_sigprocmask.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SIGPROCMASK</span></code>
if sigprocmask() is available to examine or change the signal mask
of the calling process.</p>
</li>
<li><a name="'d_sigsetjmp'"></a><b><code class="inline"><span class="w">d_sigsetjmp</span></code>
</b>
<p>From <i>d_sigsetjmp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SIGSETJMP</span></code>
symbol,
which indicates that the sigsetjmp() routine is available to
call setjmp() and optionally save the process's signal mask.</p>
</li>
<li><a name="'d_sitearch'"></a><b><code class="inline"><span class="w">d_sitearch</span></code>
</b>
<p>From <i>sitearch.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">SITEARCH</span></code>
to hold the pathname
of architecture-dependent library files for $package. If
$sitearch is the same as $archlib, then this is set to undef.</p>
</li>
<li><a name="'d_snprintf'"></a><b><code class="inline"><span class="w">d_snprintf</span></code>
</b>
<p>From <i>d_snprintf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SNPRINTF</span></code>
symbol, which
indicates to the C program that the snprintf () library function
is available.</p>
</li>
<li><a name="'d_sockatmark'"></a><b><code class="inline"><span class="w">d_sockatmark</span></code>
</b>
<p>From <i>d_sockatmark.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SOCKATMARK</span></code>
symbol, which
indicates to the C program that the sockatmark() routine is available.</p>
</li>
<li><a name="'d_sockatmarkproto'"></a><b><code class="inline"><span class="w">d_sockatmarkproto</span></code>
</b>
<p>From <i>d_sockatmarkproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SOCKATMARK_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the sockatmark() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_socket'"></a><b><code class="inline"><span class="w">d_socket</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SOCKET</span></code>
, which indicates
that the <code class="inline"><span class="w">BSD</span></code>
socket interface is supported.</p>
</li>
<li><a name="'d_socklen_t'"></a><b><code class="inline"><span class="w">d_socklen_t</span></code>
</b>
<p>From <i>d_socklen_t.U</i>:</p>
<p>This symbol will be defined if the C compiler supports socklen_t.</p>
</li>
<li><a name="'d_sockpair'"></a><b><code class="inline"><span class="w">d_sockpair</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SOCKETPAIR</span></code>
symbol, which
indicates that the <code class="inline"><span class="w">BSD</span></code>
socketpair() is supported.</p>
</li>
<li><a name="'d_socks5_init'"></a><b><code class="inline"><span class="w">d_socks5_init</span></code>
</b>
<p>From <i>d_socks5_init.U</i>:</p>
<p>This variable conditionally defines the HAS_SOCKS5_INIT symbol, which
indicates to the C program that the socks5_init() routine is available.</p>
</li>
<li><a name="'d_sprintf_returns_strlen'"></a><b><code class="inline"><span class="w">d_sprintf_returns_strlen</span></code>
</b>
<p>From <i>d_sprintf_len.U</i>:</p>
<p>This variable defines whether sprintf returns the length of the string
(as per the <code class="inline"><span class="w">ANSI</span></code>
spec). Some C libraries retain compatibility with
pre-<code class="inline"><span class="w">ANSI</span></code>
C and return a pointer to the passed in buffer; for these
this variable will be undef.</p>
</li>
<li><a name="'d_sqrtl'"></a><b><code class="inline"><span class="w">d_sqrtl</span></code>
</b>
<p>From <i>d_sqrtl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SQRTL</span></code>
symbol, which
indicates to the C program that the sqrtl() routine is available.</p>
</li>
<li><a name="'d_srand48_r'"></a><b><code class="inline"><span class="w">d_srand48_r</span></code>
</b>
<p>From <i>d_srand48_r.U</i>:</p>
<p>This variable conditionally defines the HAS_SRAND48_R symbol,
which indicates to the C program that the srand48_r()
routine is available.</p>
</li>
<li><a name="'d_srandom_r'"></a><b><code class="inline"><span class="w">d_srandom_r</span></code>
</b>
<p>From <i>d_srandom_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SRANDOM_R</span></code>
symbol,
which indicates to the C program that the srandom_r()
routine is available.</p>
</li>
<li><a name="'d_sresgproto'"></a><b><code class="inline"><span class="w">d_sresgproto</span></code>
</b>
<p>From <i>d_sresgproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETRESGID_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the setresgid() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_sresuproto'"></a><b><code class="inline"><span class="w">d_sresuproto</span></code>
</b>
<p>From <i>d_sresuproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SETRESUID_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the setresuid() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_statblks'"></a><b><code class="inline"><span class="w">d_statblks</span></code>
</b>
<p>From <i>d_statblks.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_STAT_BLOCKS</span></code>
if this system has a stat structure declaring
st_blksize and st_blocks.</p>
</li>
<li><a name="'d_statfs_f_flags'"></a><b><code class="inline"><span class="w">d_statfs_f_flags</span></code>
</b>
<p>From <i>d_statfs_f_flags.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRUCT_STATFS_F_FLAGS</span></code>
symbol, which indicates to struct statfs from has f_flags member.
This kind of struct statfs is coming from <i>sys/mount.h</i> (<code class="inline"><span class="w">BSD</span></code>
),
not from <i>sys/statfs.h</i> (<code class="inline"><span class="w">SYSV</span></code>
).</p>
</li>
<li><a name="'d_statfs_s'"></a><b><code class="inline"><span class="w">d_statfs_s</span></code>
</b>
<p>From <i>d_statfs_s.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRUCT_STATFS</span></code>
symbol,
which indicates that the struct statfs is supported.</p>
</li>
<li><a name="'d_statvfs'"></a><b><code class="inline"><span class="w">d_statvfs</span></code>
</b>
<p>From <i>d_statvfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STATVFS</span></code>
symbol, which
indicates to the C program that the statvfs() routine is available.</p>
</li>
<li><a name="'d_stdio_cnt_lval'"></a><b><code class="inline"><span class="w">d_stdio_cnt_lval</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">STDIO_CNT_LVALUE</span></code>
if the
<code class="inline"><span class="w">FILE_cnt</span></code>
macro can be used as an lvalue.</p>
</li>
<li><a name="'d_stdio_ptr_lval'"></a><b><code class="inline"><span class="w">d_stdio_ptr_lval</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">STDIO_PTR_LVALUE</span></code>
if the
<code class="inline"><span class="w">FILE_ptr</span></code>
macro can be used as an lvalue.</p>
</li>
<li><a name="'d_stdio_ptr_lval_nochange_cnt'"></a><b><code class="inline"><span class="w">d_stdio_ptr_lval_nochange_cnt</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This symbol is defined if using the <code class="inline"><span class="w">FILE_ptr</span></code>
macro as an lvalue
to increase the pointer by n leaves File_cnt(fp) unchanged.</p>
</li>
<li><a name="'d_stdio_ptr_lval_sets_cnt'"></a><b><code class="inline"><span class="w">d_stdio_ptr_lval_sets_cnt</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This symbol is defined if using the <code class="inline"><span class="w">FILE_ptr</span></code>
macro as an lvalue
to increase the pointer by n has the side effect of decreasing the
value of File_cnt(fp) by n.</p>
</li>
<li><a name="'d_stdio_stream_array'"></a><b><code class="inline"><span class="w">d_stdio_stream_array</span></code>
</b>
<p>From <i>stdio_streams.U</i>:</p>
<p>This variable tells whether there is an array holding
the stdio streams.</p>
</li>
<li><a name="'d_stdiobase'"></a><b><code class="inline"><span class="w">d_stdiobase</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_STDIO_BASE</span></code>
if this system
has a <code class="inline"><span class="w">FILE</span></code>
structure declaring a usable _base field (or equivalent)
in <i>stdio.h</i>.</p>
</li>
<li><a name="'d_stdstdio'"></a><b><code class="inline"><span class="w">d_stdstdio</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_STDIO_PTR</span></code>
if this system
has a <code class="inline"><span class="w">FILE</span></code>
structure declaring usable _ptr and _cnt fields (or
equivalent) in <i>stdio.h</i>.</p>
</li>
<li><a name="'d_strchr'"></a><b><code class="inline"><span class="w">d_strchr</span></code>
</b>
<p>From <i>d_strchr.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_STRCHR</span></code>
if strchr() and
strrchr() are available for string searching.</p>
</li>
<li><a name="'d_strcoll'"></a><b><code class="inline"><span class="w">d_strcoll</span></code>
</b>
<p>From <i>d_strcoll.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_STRCOLL</span></code>
if strcoll() is
available to compare strings using collating information.</p>
</li>
<li><a name="'d_strctcpy'"></a><b><code class="inline"><span class="w">d_strctcpy</span></code>
</b>
<p>From <i>d_strctcpy.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_STRUCT_COPY</span></code>
symbol, which
indicates to the C program that this C compiler knows how to copy
structures.</p>
</li>
<li><a name="'d_strerrm'"></a><b><code class="inline"><span class="w">d_strerrm</span></code>
</b>
<p>From <i>d_strerror.U</i>:</p>
<p>This variable holds what Strerrr is defined as to translate an error
code condition into an error message string. It could be <code class="inline"><span class="w">strerror</span></code>
or a more <code class="inline"><span class="w">complex</span></code>
macro emulating strrror with sys_errlist[], or the
<code class="inline"><span class="w">unknown</span></code>
string when both strerror and sys_errlist are missing.</p>
</li>
<li><a name="'d_strerror'"></a><b><code class="inline"><span class="w">d_strerror</span></code>
</b>
<p>From <i>d_strerror.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_STRERROR</span></code>
if strerror() is
available to translate error numbers to strings.</p>
</li>
<li><a name="'d_strerror_r'"></a><b><code class="inline"><span class="w">d_strerror_r</span></code>
</b>
<p>From <i>d_strerror_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRERROR_R</span></code>
symbol,
which indicates to the C program that the strerror_r()
routine is available.</p>
</li>
<li><a name="'d_strftime'"></a><b><code class="inline"><span class="w">d_strftime</span></code>
</b>
<p>From <i>d_strftime.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRFTIME</span></code>
symbol, which
indicates to the C program that the strftime() routine is available.</p>
</li>
<li><a name="'d_strlcat'"></a><b><code class="inline"><span class="w">d_strlcat</span></code>
</b>
<p>From <i>d_strlcat.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRLCAT</span></code>
symbol, which
indicates to the C program that the strlcat () routine is available.</p>
</li>
<li><a name="'d_strlcpy'"></a><b><code class="inline"><span class="w">d_strlcpy</span></code>
</b>
<p>From <i>d_strlcpy.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRLCPY</span></code>
symbol, which
indicates to the C program that the strlcpy () routine is available.</p>
</li>
<li><a name="'d_strtod'"></a><b><code class="inline"><span class="w">d_strtod</span></code>
</b>
<p>From <i>d_strtod.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOD</span></code>
symbol, which
indicates to the C program that the strtod() routine is available
to provide better numeric string conversion than atof().</p>
</li>
<li><a name="'d_strtol'"></a><b><code class="inline"><span class="w">d_strtol</span></code>
</b>
<p>From <i>d_strtol.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOL</span></code>
symbol, which
indicates to the C program that the strtol() routine is available
to provide better numeric string conversion than atoi() and friends.</p>
</li>
<li><a name="'d_strtold'"></a><b><code class="inline"><span class="w">d_strtold</span></code>
</b>
<p>From <i>d_strtold.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOLD</span></code>
symbol, which
indicates to the C program that the strtold() routine is available.</p>
</li>
<li><a name="'d_strtoll'"></a><b><code class="inline"><span class="w">d_strtoll</span></code>
</b>
<p>From <i>d_strtoll.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOLL</span></code>
symbol, which
indicates to the C program that the strtoll() routine is available.</p>
</li>
<li><a name="'d_strtoq'"></a><b><code class="inline"><span class="w">d_strtoq</span></code>
</b>
<p>From <i>d_strtoq.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOQ</span></code>
symbol, which
indicates to the C program that the strtoq() routine is available.</p>
</li>
<li><a name="'d_strtoul'"></a><b><code class="inline"><span class="w">d_strtoul</span></code>
</b>
<p>From <i>d_strtoul.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOUL</span></code>
symbol, which
indicates to the C program that the strtoul() routine is available
to provide conversion of strings to unsigned long.</p>
</li>
<li><a name="'d_strtoull'"></a><b><code class="inline"><span class="w">d_strtoull</span></code>
</b>
<p>From <i>d_strtoull.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOULL</span></code>
symbol, which
indicates to the C program that the strtoull() routine is available.</p>
</li>
<li><a name="'d_strtouq'"></a><b><code class="inline"><span class="w">d_strtouq</span></code>
</b>
<p>From <i>d_strtouq.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_STRTOUQ</span></code>
symbol, which
indicates to the C program that the strtouq() routine is available.</p>
</li>
<li><a name="'d_strxfrm'"></a><b><code class="inline"><span class="w">d_strxfrm</span></code>
</b>
<p>From <i>d_strxfrm.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_STRXFRM</span></code>
if strxfrm() is
available to transform strings.</p>
</li>
<li><a name="'d_suidsafe'"></a><b><code class="inline"><span class="w">d_suidsafe</span></code>
</b>
<p>From <i>d_dosuid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">SETUID_SCRIPTS_ARE_SECURE_NOW</span></code>
if setuid scripts can be secure. This test looks in <i>/dev/fd/</i>.</p>
</li>
<li><a name="'d_symlink'"></a><b><code class="inline"><span class="w">d_symlink</span></code>
</b>
<p>From <i>d_symlink.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SYMLINK</span></code>
symbol, which
indicates to the C program that the symlink() routine is available
to create symbolic links.</p>
</li>
<li><a name="'d_syscall'"></a><b><code class="inline"><span class="w">d_syscall</span></code>
</b>
<p>From <i>d_syscall.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SYSCALL</span></code>
if syscall() is
available call arbitrary system calls.</p>
</li>
<li><a name="'d_syscallproto'"></a><b><code class="inline"><span class="w">d_syscallproto</span></code>
</b>
<p>From <i>d_syscallproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SYSCALL_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the syscall() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_sysconf'"></a><b><code class="inline"><span class="w">d_sysconf</span></code>
</b>
<p>From <i>d_sysconf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_SYSCONF</span></code>
symbol, which
indicates to the C program that the sysconf() routine is available
to determine system related limits and options.</p>
</li>
<li><a name="'d_sysernlst'"></a><b><code class="inline"><span class="w">d_sysernlst</span></code>
</b>
<p>From <i>d_strerror.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SYS_ERRNOLIST</span></code>
if sys_errnolist[]
is available to translate error numbers to the symbolic name.</p>
</li>
<li><a name="'d_syserrlst'"></a><b><code class="inline"><span class="w">d_syserrlst</span></code>
</b>
<p>From <i>d_strerror.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SYS_ERRLIST</span></code>
if sys_errlist[] is
available to translate error numbers to strings.</p>
</li>
<li><a name="'d_system'"></a><b><code class="inline"><span class="w">d_system</span></code>
</b>
<p>From <i>d_system.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_SYSTEM</span></code>
if system() is
available to issue a shell command.</p>
</li>
<li><a name="'d_tcgetpgrp'"></a><b><code class="inline"><span class="w">d_tcgetpgrp</span></code>
</b>
<p>From <i>d_tcgtpgrp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TCGETPGRP</span></code>
symbol, which
indicates to the C program that the tcgetpgrp() routine is available.
to get foreground process group <code class="inline"><span class="w">ID</span></code>
.</p>
</li>
<li><a name="'d_tcsetpgrp'"></a><b><code class="inline"><span class="w">d_tcsetpgrp</span></code>
</b>
<p>From <i>d_tcstpgrp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TCSETPGRP</span></code>
symbol, which
indicates to the C program that the tcsetpgrp() routine is available
to set foreground process group <code class="inline"><span class="w">ID</span></code>
.</p>
</li>
<li><a name="'d_telldir'"></a><b><code class="inline"><span class="w">d_telldir</span></code>
</b>
<p>From <i>d_readdir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_TELLDIR</span></code>
if telldir() is
available.</p>
</li>
<li><a name="'d_telldirproto'"></a><b><code class="inline"><span class="w">d_telldirproto</span></code>
</b>
<p>From <i>d_telldirproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TELLDIR_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the telldir() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_time'"></a><b><code class="inline"><span class="w">d_time</span></code>
</b>
<p>From <i>d_time.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TIME</span></code>
symbol, which indicates
that the time() routine exists. The time() routine is normaly
provided on <code class="inline"><span class="w">UNIX</span></code>
systems.</p>
</li>
<li><a name="'d_times'"></a><b><code class="inline"><span class="w">d_times</span></code>
</b>
<p>From <i>d_times.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TIMES</span></code>
symbol, which indicates
that the times() routine exists. The times() routine is normaly
provided on <code class="inline"><span class="w">UNIX</span></code>
systems. You may have to include <sys/times.h>.</p>
</li>
<li><a name="'d_tm_tm_gmtoff'"></a><b><code class="inline"><span class="w">d_tm_tm_gmtoff</span></code>
</b>
<p>From <i>i_time.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_TM_TM_GMTOFF</span></code>
, which indicates
indicates to the C program that the struct tm has the tm_gmtoff field.</p>
</li>
<li><a name="'d_tm_tm_zone'"></a><b><code class="inline"><span class="w">d_tm_tm_zone</span></code>
</b>
<p>From <i>i_time.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_TM_TM_ZONE</span></code>
, which indicates
indicates to the C program that the struct tm has the tm_zone field.</p>
</li>
<li><a name="'d_tmpnam_r'"></a><b><code class="inline"><span class="w">d_tmpnam_r</span></code>
</b>
<p>From <i>d_tmpnam_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TMPNAM_R</span></code>
symbol,
which indicates to the C program that the tmpnam_r()
routine is available.</p>
</li>
<li><a name="'d_truncate'"></a><b><code class="inline"><span class="w">d_truncate</span></code>
</b>
<p>From <i>d_truncate.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_TRUNCATE</span></code>
if truncate() is
available to truncate files.</p>
</li>
<li><a name="'d_ttyname_r'"></a><b><code class="inline"><span class="w">d_ttyname_r</span></code>
</b>
<p>From <i>d_ttyname_r.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_TTYNAME_R</span></code>
symbol,
which indicates to the C program that the ttyname_r()
routine is available.</p>
</li>
<li><a name="'d_tzname'"></a><b><code class="inline"><span class="w">d_tzname</span></code>
</b>
<p>From <i>d_tzname.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_TZNAME</span></code>
if tzname[] is
available to access timezone names.</p>
</li>
<li><a name="'d_u32align'"></a><b><code class="inline"><span class="w">d_u32align</span></code>
</b>
<p>From <i>d_u32align.U</i>:</p>
<p>This variable tells whether you must access character data
through U32-aligned pointers.</p>
</li>
<li><a name="'d_ualarm'"></a><b><code class="inline"><span class="w">d_ualarm</span></code>
</b>
<p>From <i>d_ualarm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_UALARM</span></code>
symbol, which
indicates to the C program that the ualarm() routine is available.</p>
</li>
<li><a name="'d_umask'"></a><b><code class="inline"><span class="w">d_umask</span></code>
</b>
<p>From <i>d_umask.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_UMASK</span></code>
symbol, which
indicates to the C program that the umask() routine is available.
to set and get the value of the file creation mask.</p>
</li>
<li><a name="'d_uname'"></a><b><code class="inline"><span class="w">d_uname</span></code>
</b>
<p>From <i>d_gethname.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_UNAME</span></code>
symbol, which
indicates to the C program that the uname() routine may be
used to derive the host name.</p>
</li>
<li><a name="'d_union_semun'"></a><b><code class="inline"><span class="w">d_union_semun</span></code>
</b>
<p>From <i>d_union_semun.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_UNION_SEMUN</span></code>
if the
union semun is defined by including <sys/sem.h>.</p>
</li>
<li><a name="'d_unordered'"></a><b><code class="inline"><span class="w">d_unordered</span></code>
</b>
<p>From <i>d_unordered.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_UNORDERED</span></code>
symbol, which
indicates to the C program that the unordered() routine is available.</p>
</li>
<li><a name="'d_unsetenv'"></a><b><code class="inline"><span class="w">d_unsetenv</span></code>
</b>
<p>From <i>d_unsetenv.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_UNSETENV</span></code>
symbol, which
indicates to the C program that the unsetenv () routine is available.</p>
</li>
<li><a name="'d_usleep'"></a><b><code class="inline"><span class="w">d_usleep</span></code>
</b>
<p>From <i>d_usleep.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_USLEEP</span></code>
if usleep() is
available to do high granularity sleeps.</p>
</li>
<li><a name="'d_usleepproto'"></a><b><code class="inline"><span class="w">d_usleepproto</span></code>
</b>
<p>From <i>d_usleepproto.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_USLEEP_PROTO</span></code>
symbol,
which indicates to the C program that the system provides
a prototype for the usleep() function. Otherwise, it is
up to the program to supply one.</p>
</li>
<li><a name="'d_ustat'"></a><b><code class="inline"><span class="w">d_ustat</span></code>
</b>
<p>From <i>d_ustat.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_USTAT</span></code>
if ustat() is
available to query file system statistics by dev_t.</p>
</li>
<li><a name="'d_vendorarch'"></a><b><code class="inline"><span class="w">d_vendorarch</span></code>
</b>
<p>From <i>vendorarch.U</i>:</p>
<p>This variable conditionally defined <code class="inline"><span class="w">PERL_VENDORARCH</span></code>
.</p>
</li>
<li><a name="'d_vendorbin'"></a><b><code class="inline"><span class="w">d_vendorbin</span></code>
</b>
<p>From <i>vendorbin.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PERL_VENDORBIN</span></code>
.</p>
</li>
<li><a name="'d_vendorlib'"></a><b><code class="inline"><span class="w">d_vendorlib</span></code>
</b>
<p>From <i>vendorlib.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PERL_VENDORLIB</span></code>
.</p>
</li>
<li><a name="'d_vendorscript'"></a><b><code class="inline"><span class="w">d_vendorscript</span></code>
</b>
<p>From <i>vendorscript.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">PERL_VENDORSCRIPT</span></code>
.</p>
</li>
<li><a name="'d_vfork'"></a><b><code class="inline"><span class="w">d_vfork</span></code>
</b>
<p>From <i>d_vfork.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_VFORK</span></code>
symbol, which
indicates the vfork() routine is available.</p>
</li>
<li><a name="'d_void_closedir'"></a><b><code class="inline"><span class="w">d_void_closedir</span></code>
</b>
<p>From <i>d_closedir.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">VOID_CLOSEDIR</span></code>
if closedir()
does not return a value.</p>
</li>
<li><a name="'d_voidsig'"></a><b><code class="inline"><span class="w">d_voidsig</span></code>
</b>
<p>From <i>d_voidsig.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">VOIDSIG</span></code>
if this system
declares "void (*signal(...))()" in <i>signal.h</i>. The old way was to
declare it as "int (*signal(...))()".</p>
</li>
<li><a name="'d_voidtty'"></a><b><code class="inline"><span class="w">d_voidtty</span></code>
</b>
<p>From <i>i_sysioctl.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">USE_IOCNOTTY</span></code>
to indicate that the
ioctl() call with <code class="inline"><span class="w">TIOCNOTTY</span></code>
should be used to void tty association.
Otherwise (on <code class="inline"><span class="w">USG</span></code>
probably), it is enough to close the standard file
decriptors and do a setpgrp().</p>
</li>
<li><a name="'d_volatile'"></a><b><code class="inline"><span class="w">d_volatile</span></code>
</b>
<p>From <i>d_volatile.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HASVOLATILE</span></code>
symbol, which
indicates to the C program that this C compiler knows about the
volatile declaration.</p>
</li>
<li><a name="'d_vprintf'"></a><b><code class="inline"><span class="w">d_vprintf</span></code>
</b>
<p>From <i>d_vprintf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_VPRINTF</span></code>
symbol, which
indicates to the C program that the vprintf() routine is available
to printf with a pointer to an argument list.</p>
</li>
<li><a name="'d_vsnprintf'"></a><b><code class="inline"><span class="w">d_vsnprintf</span></code>
</b>
<p>From <i>d_snprintf.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_VSNPRINTF</span></code>
symbol, which
indicates to the C program that the vsnprintf () library function
is available.</p>
</li>
<li><a name="'d_wait4'"></a><b><code class="inline"><span class="w">d_wait4</span></code>
</b>
<p>From <i>d_wait4.U</i>:</p>
<p>This variable conditionally defines the HAS_WAIT4 symbol, which
indicates the wait4() routine is available.</p>
</li>
<li><a name="'d_waitpid'"></a><b><code class="inline"><span class="w">d_waitpid</span></code>
</b>
<p>From <i>d_waitpid.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">HAS_WAITPID</span></code>
if waitpid() is
available to wait for child process.</p>
</li>
<li><a name="'d_wcstombs'"></a><b><code class="inline"><span class="w">d_wcstombs</span></code>
</b>
<p>From <i>d_wcstombs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_WCSTOMBS</span></code>
symbol, which
indicates to the C program that the wcstombs() routine is available
to convert wide character strings to multibyte strings.</p>
</li>
<li><a name="'d_wctomb'"></a><b><code class="inline"><span class="w">d_wctomb</span></code>
</b>
<p>From <i>d_wctomb.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_WCTOMB</span></code>
symbol, which
indicates to the C program that the wctomb() routine is available
to convert a wide character to a multibyte.</p>
</li>
<li><a name="'d_writev'"></a><b><code class="inline"><span class="w">d_writev</span></code>
</b>
<p>From <i>d_writev.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">HAS_WRITEV</span></code>
symbol, which
indicates to the C program that the writev() routine is available.</p>
</li>
<li><a name="'d_xenix'"></a><b><code class="inline"><span class="w">d_xenix</span></code>
</b>
<p>From <i>Guess.U</i>:</p>
<p>This variable conditionally defines the symbol <code class="inline"><span class="w">XENIX</span></code>
, which alerts
the C program that it runs under Xenix.</p>
</li>
<li><a name="'date'"></a><b><code class="inline"><span class="w">date</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the date program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">date</span></code>
and is not useful.</p>
</li>
<li><a name="'db_hashtype'"></a><b><code class="inline"><span class="w">db_hashtype</span></code>
</b>
<p>From <i>i_db.U</i>:</p>
<p>This variable contains the type of the hash structure element
in the <db.h> header file. In older versions of <code class="inline"><span class="w">DB</span></code>
, it was
int, while in newer ones it is u_int32_t.</p>
</li>
<li><a name="'db_prefixtype'"></a><b><code class="inline"><span class="w">db_prefixtype</span></code>
</b>
<p>From <i>i_db.U</i>:</p>
<p>This variable contains the type of the prefix structure element
in the <db.h> header file. In older versions of <code class="inline"><span class="w">DB</span></code>
, it was
int, while in newer ones it is size_t.</p>
</li>
<li><a name="'db_version_major'"></a><b><code class="inline"><span class="w">db_version_major</span></code>
</b>
<p>From <i>i_db.U</i>:</p>
<p>This variable contains the major version number of
Berkeley <code class="inline"><span class="w">DB</span></code>
found in the <db.h> header file.</p>
</li>
<li><a name="'db_version_minor'"></a><b><code class="inline"><span class="w">db_version_minor</span></code>
</b>
<p>From <i>i_db.U</i>:</p>
<p>This variable contains the minor version number of
Berkeley <code class="inline"><span class="w">DB</span></code>
found in the <db.h> header file.
For <code class="inline"><span class="w">DB</span></code>
version 1 this is always 0.</p>
</li>
<li><a name="'db_version_patch'"></a><b><code class="inline"><span class="w">db_version_patch</span></code>
</b>
<p>From <i>i_db.U</i>:</p>
<p>This variable contains the patch version number of
Berkeley <code class="inline"><span class="w">DB</span></code>
found in the <db.h> header file.
For <code class="inline"><span class="w">DB</span></code>
version 1 this is always 0.</p>
</li>
<li><a name="'defvoidused'"></a><b><code class="inline"><span class="w">defvoidused</span></code>
</b>
<p>From <i>voidflags.U</i>:</p>
<p>This variable contains the default value of the <code class="inline"><span class="w">VOIDUSED</span></code>
symbol (15).</p>
</li>
<li><a name="'direntrytype'"></a><b><code class="inline"><span class="w">direntrytype</span></code>
</b>
<p>From <i>i_dirent.U</i>:</p>
<p>This symbol is set to <code class="inline"><span class="w">struct</span> <span class="w">direct</span></code>
or <code class="inline"><span class="w">struct</span> <span class="w">dirent</span></code>
depending on
whether dirent is available or not. You should use this pseudo type to
portably declare your directory entries.</p>
</li>
<li><a name="'dlext'"></a><b><code class="inline"><span class="w">dlext</span></code>
</b>
<p>From <i>dlext.U</i>:</p>
<p>This variable contains the extension that is to be used for the
dynamically loaded modules that perl generaties.</p>
</li>
<li><a name="'dlsrc'"></a><b><code class="inline"><span class="w">dlsrc</span></code>
</b>
<p>From <i>dlsrc.U</i>:</p>
<p>This variable contains the name of the dynamic loading file that
will be used with the package.</p>
</li>
<li><a name="'doublesize'"></a><b><code class="inline"><span class="w">doublesize</span></code>
</b>
<p>From <i>doublesize.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">DOUBLESIZE</span></code>
symbol, which
indicates to the C program how many bytes there are in a double.</p>
</li>
<li><a name="'drand01'"></a><b><code class="inline"><span class="w">drand01</span></code>
</b>
<p>From <i>randfunc.U</i>:</p>
<p>Indicates the macro to be used to generate normalized
random numbers. Uses randfunc, often divided by
(double) (((unsigned long) 1 << randbits)) in order to
normalize the result.
In C programs, the macro <code class="inline"><span class="w">Drand01</span></code>
is mapped to drand01.</p>
</li>
<li><a name="'drand48_r_proto'"></a><b><code class="inline"><span class="w">drand48_r_proto</span></code>
</b>
<p>From <i>d_drand48_r.U</i>:</p>
<p>This variable encodes the prototype of drand48_r.
It is zero if d_drand48_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_drand48_r
is defined.</p>
</li>
<li><a name="'dynamic_ext'"></a><b><code class="inline"><span class="w">dynamic_ext</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds a list of <code class="inline"><span class="w">XS</span></code>
extension files we want to
link dynamically into the package. It is used by Makefile.</p>
</li>
</ul>
<a name="e"></a><h2>e</h2>
<ul>
<li><a name="'eagain'"></a><b><code class="inline"><span class="w">eagain</span></code>
</b>
<p>From <i>nblock_io.U</i>:</p>
<p>This variable bears the symbolic errno code set by read() when no
data is present on the file and non-blocking I/O was enabled (otherwise,
read() blocks naturally).</p>
</li>
<li><a name="'ebcdic'"></a><b><code class="inline"><span class="w">ebcdic</span></code>
</b>
<p>From <i>ebcdic.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">EBCDIC</span></code>
if this
system uses <code class="inline"><span class="w">EBCDIC</span></code>
encoding. Among other things, this
means that the character ranges are not contiguous.
See <i>trnl.U</i></p>
</li>
<li><a name="'echo'"></a><b><code class="inline"><span class="w">echo</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the echo program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">echo</span></code>
and is not useful.</p>
</li>
<li><a name="'egrep'"></a><b><code class="inline"><span class="w">egrep</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the egrep program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">egrep</span></code>
and is not useful.</p>
</li>
<li><a name="'emacs'"></a><b><code class="inline"><span class="w">emacs</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'endgrent_r_proto'"></a><b><code class="inline"><span class="w">endgrent_r_proto</span></code>
</b>
<p>From <i>d_endgrent_r.U</i>:</p>
<p>This variable encodes the prototype of endgrent_r.
It is zero if d_endgrent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_endgrent_r
is defined.</p>
</li>
<li><a name="'endhostent_r_proto'"></a><b><code class="inline"><span class="w">endhostent_r_proto</span></code>
</b>
<p>From <i>d_endhostent_r.U</i>:</p>
<p>This variable encodes the prototype of endhostent_r.
It is zero if d_endhostent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_endhostent_r
is defined.</p>
</li>
<li><a name="'endnetent_r_proto'"></a><b><code class="inline"><span class="w">endnetent_r_proto</span></code>
</b>
<p>From <i>d_endnetent_r.U</i>:</p>
<p>This variable encodes the prototype of endnetent_r.
It is zero if d_endnetent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_endnetent_r
is defined.</p>
</li>
<li><a name="'endprotoent_r_proto'"></a><b><code class="inline"><span class="w">endprotoent_r_proto</span></code>
</b>
<p>From <i>d_endprotoent_r.U</i>:</p>
<p>This variable encodes the prototype of endprotoent_r.
It is zero if d_endprotoent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_endprotoent_r
is defined.</p>
</li>
<li><a name="'endpwent_r_proto'"></a><b><code class="inline"><span class="w">endpwent_r_proto</span></code>
</b>
<p>From <i>d_endpwent_r.U</i>:</p>
<p>This variable encodes the prototype of endpwent_r.
It is zero if d_endpwent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_endpwent_r
is defined.</p>
</li>
<li><a name="'endservent_r_proto'"></a><b><code class="inline"><span class="w">endservent_r_proto</span></code>
</b>
<p>From <i>d_endservent_r.U</i>:</p>
<p>This variable encodes the prototype of endservent_r.
It is zero if d_endservent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_endservent_r
is defined.</p>
</li>
<li><a name="'eunicefix'"></a><b><code class="inline"><span class="w">eunicefix</span></code>
</b>
<p>From <i>Init.U</i>:</p>
<p>When running under Eunice this variable contains a command which will
convert a shell script to the proper form of text file for it to be
executable by the shell. On other systems it is a no-op.</p>
</li>
<li><a name="'exe_ext'"></a><b><code class="inline"><span class="w">exe_ext</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This is an old synonym for _exe.</p>
</li>
<li><a name="'expr'"></a><b><code class="inline"><span class="w">expr</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the expr program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">expr</span></code>
and is not useful.</p>
</li>
<li><a name="'extensions'"></a><b><code class="inline"><span class="w">extensions</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds a list of all extension files (both <code class="inline"><span class="w">XS</span></code>
and
non-xs linked into the package. It is propagated to <i>Config.pm</i>
and is typically used to test whether a particular extesion
is available.</p>
</li>
<li><a name="'extras'"></a><b><code class="inline"><span class="w">extras</span></code>
</b>
<p>From <i>Extras.U</i>:</p>
<p>This variable holds a list of extra modules to install.</p>
</li>
</ul>
<a name="f"></a><h2>f</h2>
<ul>
<li><a name="'fflushall'"></a><b><code class="inline"><span class="w">fflushall</span></code>
</b>
<p>From <i>fflushall.U</i>:</p>
<p>This symbol, if defined, tells that to flush
all pending stdio output one must loop through all
the stdio file handles stored in an array and fflush them.
Note that if fflushNULL is defined, fflushall will not
even be probed for and will be left undefined.</p>
</li>
<li><a name="'fflushNULL'"></a><b><code class="inline"><span class="w">fflushNULL</span></code>
</b>
<p>From <i>fflushall.U</i>:</p>
<p>This symbol, if defined, tells that fflush(<code class="inline"><span class="w">NULL</span></code>
) does flush
all pending stdio output.</p>
</li>
<li><a name="'find'"></a><b><code class="inline"><span class="w">find</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'firstmakefile'"></a><b><code class="inline"><span class="w">firstmakefile</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This variable defines the first file searched by make. On unix,
it is makefile (then Makefile). On case-insensitive systems,
it might be something else. This is only used to deal with
convoluted make depend tricks.</p>
</li>
<li><a name="'flex'"></a><b><code class="inline"><span class="w">flex</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'fpossize'"></a><b><code class="inline"><span class="w">fpossize</span></code>
</b>
<p>From <i>fpossize.U</i>:</p>
<p>This variable contains the size of a fpostype in bytes.</p>
</li>
<li><a name="'fpostype'"></a><b><code class="inline"><span class="w">fpostype</span></code>
</b>
<p>From <i>fpostype.U</i>:</p>
<p>This variable defines Fpos_t to be something like fpos_t, long,
uint, or whatever type is used to declare file positions in libc.</p>
</li>
<li><a name="'freetype'"></a><b><code class="inline"><span class="w">freetype</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable contains the return type of free(). It is usually
void, but occasionally int.</p>
</li>
<li><a name="'from'"></a><b><code class="inline"><span class="w">from</span></code>
</b>
<p>From <i>Cross.U</i>:</p>
<p>This variable contains the command used by Configure
to copy files from the target host. Useful and available
only during Perl build.
The string <code class="inline"><span class="j">:</span></code>
if not cross-compiling.</p>
</li>
<li><a name="'full_ar'"></a><b><code class="inline"><span class="w">full_ar</span></code>
</b>
<p>From <i>Loc_ar.U</i>:</p>
<p>This variable contains the full pathname to <code class="inline"><span class="w">ar</span></code>
, whether or
not the user has specified <code class="inline"><span class="w">portability</span></code>
. This is only used
in the <i>Makefile.SH</i>.</p>
</li>
<li><a name="'full_csh'"></a><b><code class="inline"><span class="w">full_csh</span></code>
</b>
<p>From <i>d_csh.U</i>:</p>
<p>This variable contains the full pathname to <code class="inline"><span class="w">csh</span></code>
, whether or
not the user has specified <code class="inline"><span class="w">portability</span></code>
. This is only used
in the compiled C program, and we assume that all systems which
can share this executable will have the same full pathname to
<i>csh.</i></p>
</li>
<li><a name="'full_sed'"></a><b><code class="inline"><span class="w">full_sed</span></code>
</b>
<p>From <i>Loc_sed.U</i>:</p>
<p>This variable contains the full pathname to <code class="inline"><span class="w">sed</span></code>
, whether or
not the user has specified <code class="inline"><span class="w">portability</span></code>
. This is only used
in the compiled C program, and we assume that all systems which
can share this executable will have the same full pathname to
<i>sed.</i></p>
</li>
</ul>
<a name="g"></a><h2>g</h2>
<ul>
<li><a name="'gccansipedantic'"></a><b><code class="inline"><span class="w">gccansipedantic</span></code>
</b>
<p>From <i>gccvers.U</i>:</p>
<p>If <code class="inline"><span class="w">GNU</span></code>
cc (gcc) is used, this variable will enable (if set) the
-ansi and -pedantic ccflags for building core files (through
cflags script). (See <i>Porting/pumpkin.pod</i> for full description).</p>
</li>
<li><a name="'gccosandvers'"></a><b><code class="inline"><span class="w">gccosandvers</span></code>
</b>
<p>From <i>gccvers.U</i>:</p>
<p>If <code class="inline"><span class="w">GNU</span></code>
cc (gcc) is used, this variable holds the operating system
and version used to compile gcc. It is set to '' if not gcc,
or if nothing useful can be parsed as the os version.</p>
</li>
<li><a name="'gccversion'"></a><b><code class="inline"><span class="w">gccversion</span></code>
</b>
<p>From <i>gccvers.U</i>:</p>
<p>If <code class="inline"><span class="w">GNU</span></code>
cc (gcc) is used, this variable holds <code class="inline"><span class="n">1</span></code>
or <code class="inline"><span class="n">2</span></code>
to
indicate whether the compiler is version 1 or 2. This is used in
setting some of the default cflags. It is set to '' if not gcc.</p>
</li>
<li><a name="'getgrent_r_proto'"></a><b><code class="inline"><span class="w">getgrent_r_proto</span></code>
</b>
<p>From <i>d_getgrent_r.U</i>:</p>
<p>This variable encodes the prototype of getgrent_r.
It is zero if d_getgrent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getgrent_r
is defined.</p>
</li>
<li><a name="'getgrgid_r_proto'"></a><b><code class="inline"><span class="w">getgrgid_r_proto</span></code>
</b>
<p>From <i>d_getgrgid_r.U</i>:</p>
<p>This variable encodes the prototype of getgrgid_r.
It is zero if d_getgrgid_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getgrgid_r
is defined.</p>
</li>
<li><a name="'getgrnam_r_proto'"></a><b><code class="inline"><span class="w">getgrnam_r_proto</span></code>
</b>
<p>From <i>d_getgrnam_r.U</i>:</p>
<p>This variable encodes the prototype of getgrnam_r.
It is zero if d_getgrnam_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getgrnam_r
is defined.</p>
</li>
<li><a name="'gethostbyaddr_r_proto'"></a><b><code class="inline"><span class="w">gethostbyaddr_r_proto</span></code>
</b>
<p>From <i>d_gethostbyaddr_r.U</i>:</p>
<p>This variable encodes the prototype of gethostbyaddr_r.
It is zero if d_gethostbyaddr_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_gethostbyaddr_r
is defined.</p>
</li>
<li><a name="'gethostbyname_r_proto'"></a><b><code class="inline"><span class="w">gethostbyname_r_proto</span></code>
</b>
<p>From <i>d_gethostbyname_r.U</i>:</p>
<p>This variable encodes the prototype of gethostbyname_r.
It is zero if d_gethostbyname_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_gethostbyname_r
is defined.</p>
</li>
<li><a name="'gethostent_r_proto'"></a><b><code class="inline"><span class="w">gethostent_r_proto</span></code>
</b>
<p>From <i>d_gethostent_r.U</i>:</p>
<p>This variable encodes the prototype of gethostent_r.
It is zero if d_gethostent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_gethostent_r
is defined.</p>
</li>
<li><a name="'getlogin_r_proto'"></a><b><code class="inline"><span class="w">getlogin_r_proto</span></code>
</b>
<p>From <i>d_getlogin_r.U</i>:</p>
<p>This variable encodes the prototype of getlogin_r.
It is zero if d_getlogin_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getlogin_r
is defined.</p>
</li>
<li><a name="'getnetbyaddr_r_proto'"></a><b><code class="inline"><span class="w">getnetbyaddr_r_proto</span></code>
</b>
<p>From <i>d_getnetbyaddr_r.U</i>:</p>
<p>This variable encodes the prototype of getnetbyaddr_r.
It is zero if d_getnetbyaddr_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getnetbyaddr_r
is defined.</p>
</li>
<li><a name="'getnetbyname_r_proto'"></a><b><code class="inline"><span class="w">getnetbyname_r_proto</span></code>
</b>
<p>From <i>d_getnetbyname_r.U</i>:</p>
<p>This variable encodes the prototype of getnetbyname_r.
It is zero if d_getnetbyname_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getnetbyname_r
is defined.</p>
</li>
<li><a name="'getnetent_r_proto'"></a><b><code class="inline"><span class="w">getnetent_r_proto</span></code>
</b>
<p>From <i>d_getnetent_r.U</i>:</p>
<p>This variable encodes the prototype of getnetent_r.
It is zero if d_getnetent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getnetent_r
is defined.</p>
</li>
<li><a name="'getprotobyname_r_proto'"></a><b><code class="inline"><span class="w">getprotobyname_r_proto</span></code>
</b>
<p>From <i>d_getprotobyname_r.U</i>:</p>
<p>This variable encodes the prototype of getprotobyname_r.
It is zero if d_getprotobyname_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getprotobyname_r
is defined.</p>
</li>
<li><a name="'getprotobynumber_r_proto'"></a><b><code class="inline"><span class="w">getprotobynumber_r_proto</span></code>
</b>
<p>From <i>d_getprotobynumber_r.U</i>:</p>
<p>This variable encodes the prototype of getprotobynumber_r.
It is zero if d_getprotobynumber_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getprotobynumber_r
is defined.</p>
</li>
<li><a name="'getprotoent_r_proto'"></a><b><code class="inline"><span class="w">getprotoent_r_proto</span></code>
</b>
<p>From <i>d_getprotoent_r.U</i>:</p>
<p>This variable encodes the prototype of getprotoent_r.
It is zero if d_getprotoent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getprotoent_r
is defined.</p>
</li>
<li><a name="'getpwent_r_proto'"></a><b><code class="inline"><span class="w">getpwent_r_proto</span></code>
</b>
<p>From <i>d_getpwent_r.U</i>:</p>
<p>This variable encodes the prototype of getpwent_r.
It is zero if d_getpwent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getpwent_r
is defined.</p>
</li>
<li><a name="'getpwnam_r_proto'"></a><b><code class="inline"><span class="w">getpwnam_r_proto</span></code>
</b>
<p>From <i>d_getpwnam_r.U</i>:</p>
<p>This variable encodes the prototype of getpwnam_r.
It is zero if d_getpwnam_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getpwnam_r
is defined.</p>
</li>
<li><a name="'getpwuid_r_proto'"></a><b><code class="inline"><span class="w">getpwuid_r_proto</span></code>
</b>
<p>From <i>d_getpwuid_r.U</i>:</p>
<p>This variable encodes the prototype of getpwuid_r.
It is zero if d_getpwuid_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getpwuid_r
is defined.</p>
</li>
<li><a name="'getservbyname_r_proto'"></a><b><code class="inline"><span class="w">getservbyname_r_proto</span></code>
</b>
<p>From <i>d_getservbyname_r.U</i>:</p>
<p>This variable encodes the prototype of getservbyname_r.
It is zero if d_getservbyname_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getservbyname_r
is defined.</p>
</li>
<li><a name="'getservbyport_r_proto'"></a><b><code class="inline"><span class="w">getservbyport_r_proto</span></code>
</b>
<p>From <i>d_getservbyport_r.U</i>:</p>
<p>This variable encodes the prototype of getservbyport_r.
It is zero if d_getservbyport_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getservbyport_r
is defined.</p>
</li>
<li><a name="'getservent_r_proto'"></a><b><code class="inline"><span class="w">getservent_r_proto</span></code>
</b>
<p>From <i>d_getservent_r.U</i>:</p>
<p>This variable encodes the prototype of getservent_r.
It is zero if d_getservent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getservent_r
is defined.</p>
</li>
<li><a name="'getspnam_r_proto'"></a><b><code class="inline"><span class="w">getspnam_r_proto</span></code>
</b>
<p>From <i>d_getspnam_r.U</i>:</p>
<p>This variable encodes the prototype of getspnam_r.
It is zero if d_getspnam_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_getspnam_r
is defined.</p>
</li>
<li><a name="'gidformat'"></a><b><code class="inline"><span class="w">gidformat</span></code>
</b>
<p>From <i>gidf.U</i>:</p>
<p>This variable contains the format string used for printing a Gid_t.</p>
</li>
<li><a name="'gidsign'"></a><b><code class="inline"><span class="w">gidsign</span></code>
</b>
<p>From <i>gidsign.U</i>:</p>
<p>This variable contains the signedness of a gidtype.
1 for unsigned, -1 for signed.</p>
</li>
<li><a name="'gidsize'"></a><b><code class="inline"><span class="w">gidsize</span></code>
</b>
<p>From <i>gidsize.U</i>:</p>
<p>This variable contains the size of a gidtype in bytes.</p>
</li>
<li><a name="'gidtype'"></a><b><code class="inline"><span class="w">gidtype</span></code>
</b>
<p>From <i>gidtype.U</i>:</p>
<p>This variable defines Gid_t to be something like gid_t, int,
ushort, or whatever type is used to declare the return type
of getgid(). Typically, it is the type of group ids in the kernel.</p>
</li>
<li><a name="'glibpth'"></a><b><code class="inline"><span class="w">glibpth</span></code>
</b>
<p>From <i>libpth.U</i>:</p>
<p>This variable holds the general path (space-separated) used to
find libraries. It may contain directories that do not exist on
this platform, libpth is the cleaned-up version.</p>
</li>
<li><a name="'gmake'"></a><b><code class="inline"><span class="w">gmake</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the gmake program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">gmake</span></code>
and is not useful.</p>
</li>
<li><a name="'gmtime_r_proto'"></a><b><code class="inline"><span class="w">gmtime_r_proto</span></code>
</b>
<p>From <i>d_gmtime_r.U</i>:</p>
<p>This variable encodes the prototype of gmtime_r.
It is zero if d_gmtime_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_gmtime_r
is defined.</p>
</li>
<li><a name="'gnulibc_version'"></a><b><code class="inline"><span class="w">gnulibc_version</span></code>
</b>
<p>From <i>d_gnulibc.U</i>:</p>
<p>This variable contains the version number of the <code class="inline"><span class="w">GNU</span></code>
C library.
It is usually something like <i>2.2.5</i>. It is a plain '' if this
is not the <code class="inline"><span class="w">GNU</span></code>
C library, or if the version is unknown.</p>
</li>
<li><a name="'grep'"></a><b><code class="inline"><a class="l_k" href="functions/grep.html">grep</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the grep program. After Configure runs,
the value is reset to a plain <code class="inline"><a class="l_k" href="functions/grep.html">grep</a></code> and is not useful.</p>
</li>
<li><a name="'groupcat'"></a><b><code class="inline"><span class="w">groupcat</span></code>
</b>
<p>From <i>nis.U</i>:</p>
<p>This variable contains a command that produces the text of the
<i>/etc/group</i> file. This is normally "cat <i>/etc/group</i>", but can be
"ypcat group" when <code class="inline"><span class="w">NIS</span></code>
is used.
On some systems, such as os390, there may be no equivalent
command, in which case this variable is unset.</p>
</li>
<li><a name="'groupstype'"></a><b><code class="inline"><span class="w">groupstype</span></code>
</b>
<p>From <i>groupstype.U</i>:</p>
<p>This variable defines Groups_t to be something like gid_t, int,
ushort, or whatever type is used for the second argument to
getgroups() and setgroups(). Usually, this is the same as
gidtype (gid_t), but sometimes it isn't.</p>
</li>
<li><a name="'gzip'"></a><b><code class="inline"><span class="w">gzip</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the gzip program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">gzip</span></code>
and is not useful.</p>
</li>
</ul>
<a name="h"></a><h2>h</h2>
<ul>
<li><a name="'h_fcntl'"></a><b><code class="inline"><span class="w">h_fcntl</span></code>
</b>
<p>From <i>h_fcntl.U</i>:</p>
<p>This is variable gets set in various places to tell i_fcntl that
<fcntl.h> should be included.</p>
</li>
<li><a name="'h_sysfile'"></a><b><code class="inline"><span class="w">h_sysfile</span></code>
</b>
<p>From <i>h_sysfile.U</i>:</p>
<p>This is variable gets set in various places to tell i_sys_file that
<sys/file.h> should be included.</p>
</li>
<li><a name="'hint'"></a><b><code class="inline"><span class="w">hint</span></code>
</b>
<p>From <i>Oldconfig.U</i>:</p>
<p>Gives the type of hints used for previous answers. May be one of
<code class="inline"><span class="w">default</span></code>
, <code class="inline"><span class="w">recommended</span></code>
or <code class="inline"><span class="w">previous</span></code>
.</p>
</li>
<li><a name="'hostcat'"></a><b><code class="inline"><span class="w">hostcat</span></code>
</b>
<p>From <i>nis.U</i>:</p>
<p>This variable contains a command that produces the text of the
<i>/etc/hosts</i> file. This is normally "cat <i>/etc/hosts</i>", but can be
"ypcat hosts" when <code class="inline"><span class="w">NIS</span></code>
is used.
On some systems, such as os390, there may be no equivalent
command, in which case this variable is unset.</p>
</li>
<li><a name="'html1dir'"></a><b><code class="inline"><span class="w">html1dir</span></code>
</b>
<p>From <i>html1dir.U</i>:</p>
<p>This variable contains the name of the directory in which html
source pages are to be put. This directory is for pages
that describe whole programs, not libraries or modules. It
is intended to correspond roughly to section 1 of the Unix
manuals.</p>
</li>
<li><a name="'html1direxp'"></a><b><code class="inline"><span class="w">html1direxp</span></code>
</b>
<p>From <i>html1dir.U</i>:</p>
<p>This variable is the same as the html1dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'html3dir'"></a><b><code class="inline"><span class="w">html3dir</span></code>
</b>
<p>From <i>html3dir.U</i>:</p>
<p>This variable contains the name of the directory in which html
source pages are to be put. This directory is for pages
that describe libraries or modules. It is intended to
correspond roughly to section 3 of the Unix manuals.</p>
</li>
<li><a name="'html3direxp'"></a><b><code class="inline"><span class="w">html3direxp</span></code>
</b>
<p>From <i>html3dir.U</i>:</p>
<p>This variable is the same as the html3dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
</ul>
<a name="i"></a><h2>i</h2>
<ul>
<li><a name="'i16size'"></a><b><code class="inline"><span class="w">i16size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an I16 in bytes.</p>
</li>
<li><a name="'i16type'"></a><b><code class="inline"><span class="w">i16type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's I16.</p>
</li>
<li><a name="'i32size'"></a><b><code class="inline"><span class="w">i32size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an I32 in bytes.</p>
</li>
<li><a name="'i32type'"></a><b><code class="inline"><span class="w">i32type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's I32.</p>
</li>
<li><a name="'i64size'"></a><b><code class="inline"><span class="w">i64size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an I64 in bytes.</p>
</li>
<li><a name="'i64type'"></a><b><code class="inline"><span class="w">i64type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's I64.</p>
</li>
<li><a name="'i8size'"></a><b><code class="inline"><span class="w">i8size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an I8 in bytes.</p>
</li>
<li><a name="'i8type'"></a><b><code class="inline"><span class="w">i8type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's I8.</p>
</li>
<li><a name="'i_arpainet'"></a><b><code class="inline"><span class="w">i_arpainet</span></code>
</b>
<p>From <i>i_arpainet.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_ARPA_INET</span></code>
symbol,
and indicates whether a C program should include <arpa/inet.h>.</p>
</li>
<li><a name="'i_bsdioctl'"></a><b><code class="inline"><span class="w">i_bsdioctl</span></code>
</b>
<p>From <i>i_sysioctl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_BSDIOCTL</span></code>
symbol, which
indicates to the C program that <sys/bsdioctl.h> exists and should
be included.</p>
</li>
<li><a name="'i_crypt'"></a><b><code class="inline"><span class="w">i_crypt</span></code>
</b>
<p>From <i>i_crypt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_CRYPT</span></code>
symbol, and indicates
whether a C program should include <crypt.h>.</p>
</li>
<li><a name="'i_db'"></a><b><code class="inline"><span class="w">i_db</span></code>
</b>
<p>From <i>i_db.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_DB</span></code>
symbol, and indicates
whether a C program may include Berkeley's <code class="inline"><span class="w">DB</span></code>
include file <db.h>.</p>
</li>
<li><a name="'i_dbm'"></a><b><code class="inline"><span class="w">i_dbm</span></code>
</b>
<p>From <i>i_dbm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_DBM</span></code>
symbol, which
indicates to the C program that <dbm.h> exists and should
be included.</p>
</li>
<li><a name="'i_dirent'"></a><b><code class="inline"><span class="w">i_dirent</span></code>
</b>
<p>From <i>i_dirent.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_DIRENT</span></code>
, which indicates
to the C program that it should include <dirent.h>.</p>
</li>
<li><a name="'i_dld'"></a><b><code class="inline"><span class="w">i_dld</span></code>
</b>
<p>From <i>i_dld.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_DLD</span></code>
symbol, which
indicates to the C program that <dld.h> (<code class="inline"><span class="w">GNU</span></code>
dynamic loading)
exists and should be included.</p>
</li>
<li><a name="'i_dlfcn'"></a><b><code class="inline"><span class="w">i_dlfcn</span></code>
</b>
<p>From <i>i_dlfcn.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_DLFCN</span></code>
symbol, which
indicates to the C program that <dlfcn.h> exists and should
be included.</p>
</li>
<li><a name="'i_fcntl'"></a><b><code class="inline"><span class="w">i_fcntl</span></code>
</b>
<p>From <i>i_fcntl.U</i>:</p>
<p>This variable controls the value of <code class="inline"><span class="w">I_FCNTL</span></code>
(which tells
the C program to include <fcntl.h>).</p>
</li>
<li><a name="'i_float'"></a><b><code class="inline"><span class="w">i_float</span></code>
</b>
<p>From <i>i_float.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_FLOAT</span></code>
symbol, and indicates
whether a C program may include <float.h> to get symbols like <code class="inline"><span class="w">DBL_MAX</span></code>
or <code class="inline"><span class="w">DBL_MIN</span></code>
, <i>i.e</i>. machine dependent floating point values.</p>
</li>
<li><a name="'i_fp'"></a><b><code class="inline"><span class="w">i_fp</span></code>
</b>
<p>From <i>i_fp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_FP</span></code>
symbol, and indicates
whether a C program should include <fp.h>.</p>
</li>
<li><a name="'i_fp_class'"></a><b><code class="inline"><span class="w">i_fp_class</span></code>
</b>
<p>From <i>i_fp_class.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_FP_CLASS</span></code>
symbol, and indicates
whether a C program should include <fp_class.h>.</p>
</li>
<li><a name="'i_gdbm'"></a><b><code class="inline"><span class="w">i_gdbm</span></code>
</b>
<p>From <i>i_gdbm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_GDBM</span></code>
symbol, which
indicates to the C program that <gdbm.h> exists and should
be included.</p>
</li>
<li><a name="'i_grp'"></a><b><code class="inline"><span class="w">i_grp</span></code>
</b>
<p>From <i>i_grp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_GRP</span></code>
symbol, and indicates
whether a C program should include <grp.h>.</p>
</li>
<li><a name="'i_ieeefp'"></a><b><code class="inline"><span class="w">i_ieeefp</span></code>
</b>
<p>From <i>i_ieeefp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_IEEEFP</span></code>
symbol, and indicates
whether a C program should include <ieeefp.h>.</p>
</li>
<li><a name="'i_inttypes'"></a><b><code class="inline"><span class="w">i_inttypes</span></code>
</b>
<p>From <i>i_inttypes.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_INTTYPES</span></code>
symbol,
and indicates whether a C program should include <inttypes.h>.</p>
</li>
<li><a name="'i_langinfo'"></a><b><code class="inline"><span class="w">i_langinfo</span></code>
</b>
<p>From <i>i_langinfo.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_LANGINFO</span></code>
symbol,
and indicates whether a C program should include <langinfo.h>.</p>
</li>
<li><a name="'i_libutil'"></a><b><code class="inline"><span class="w">i_libutil</span></code>
</b>
<p>From <i>i_libutil.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_LIBUTIL</span></code>
symbol, and indicates
whether a C program should include <libutil.h>.</p>
</li>
<li><a name="'i_limits'"></a><b><code class="inline"><span class="w">i_limits</span></code>
</b>
<p>From <i>i_limits.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_LIMITS</span></code>
symbol, and indicates
whether a C program may include <limits.h> to get symbols like <code class="inline"><span class="w">WORD_BIT</span></code>
and friends.</p>
</li>
<li><a name="'i_locale'"></a><b><code class="inline"><span class="w">i_locale</span></code>
</b>
<p>From <i>i_locale.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_LOCALE</span></code>
symbol,
and indicates whether a C program should include <locale.h>.</p>
</li>
<li><a name="'i_machcthr'"></a><b><code class="inline"><span class="w">i_machcthr</span></code>
</b>
<p>From <i>i_machcthr.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_MACH_CTHREADS</span></code>
symbol,
and indicates whether a C program should include <mach/cthreads.h>.</p>
</li>
<li><a name="'i_malloc'"></a><b><code class="inline"><span class="w">i_malloc</span></code>
</b>
<p>From <i>i_malloc.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_MALLOC</span></code>
symbol, and indicates
whether a C program should include <malloc.h>.</p>
</li>
<li><a name="'i_math'"></a><b><code class="inline"><span class="w">i_math</span></code>
</b>
<p>From <i>i_math.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_MATH</span></code>
symbol, and indicates
whether a C program may include <math.h>.</p>
</li>
<li><a name="'i_memory'"></a><b><code class="inline"><span class="w">i_memory</span></code>
</b>
<p>From <i>i_memory.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_MEMORY</span></code>
symbol, and indicates
whether a C program should include <memory.h>.</p>
</li>
<li><a name="'i_mntent'"></a><b><code class="inline"><span class="w">i_mntent</span></code>
</b>
<p>From <i>i_mntent.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_MNTENT</span></code>
symbol, and indicates
whether a C program should include <mntent.h>.</p>
</li>
<li><a name="'i_ndbm'"></a><b><code class="inline"><span class="w">i_ndbm</span></code>
</b>
<p>From <i>i_ndbm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_NDBM</span></code>
symbol, which
indicates to the C program that <ndbm.h> exists and should
be included.</p>
</li>
<li><a name="'i_netdb'"></a><b><code class="inline"><span class="w">i_netdb</span></code>
</b>
<p>From <i>i_netdb.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_NETDB</span></code>
symbol, and indicates
whether a C program should include <netdb.h>.</p>
</li>
<li><a name="'i_neterrno'"></a><b><code class="inline"><span class="w">i_neterrno</span></code>
</b>
<p>From <i>i_neterrno.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_NET_ERRNO</span></code>
symbol, which
indicates to the C program that <net/errno.h> exists and should
be included.</p>
</li>
<li><a name="'i_netinettcp'"></a><b><code class="inline"><span class="w">i_netinettcp</span></code>
</b>
<p>From <i>i_netinettcp.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_NETINET_TCP</span></code>
symbol,
and indicates whether a C program should include <netinet/tcp.h>.</p>
</li>
<li><a name="'i_niin'"></a><b><code class="inline"><span class="w">i_niin</span></code>
</b>
<p>From <i>i_niin.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_NETINET_IN</span></code>
, which indicates
to the C program that it should include <netinet/in.h>. Otherwise,
you may try <sys/in.h>.</p>
</li>
<li><a name="'i_poll'"></a><b><code class="inline"><span class="w">i_poll</span></code>
</b>
<p>From <i>i_poll.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_POLL</span></code>
symbol, and indicates
whether a C program should include <poll.h>.</p>
</li>
<li><a name="'i_prot'"></a><b><code class="inline"><span class="w">i_prot</span></code>
</b>
<p>From <i>i_prot.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_PROT</span></code>
symbol, and indicates
whether a C program should include <prot.h>.</p>
</li>
<li><a name="'i_pthread'"></a><b><code class="inline"><span class="w">i_pthread</span></code>
</b>
<p>From <i>i_pthread.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_PTHREAD</span></code>
symbol,
and indicates whether a C program should include <pthread.h>.</p>
</li>
<li><a name="'i_pwd'"></a><b><code class="inline"><span class="w">i_pwd</span></code>
</b>
<p>From <i>i_pwd.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_PWD</span></code>
, which indicates
to the C program that it should include <pwd.h>.</p>
</li>
<li><a name="'i_rpcsvcdbm'"></a><b><code class="inline"><span class="w">i_rpcsvcdbm</span></code>
</b>
<p>From <i>i_dbm.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_RPCSVC_DBM</span></code>
symbol, which
indicates to the C program that <rpcsvc/dbm.h> exists and should
be included. Some System V systems might need this instead of <dbm.h>.</p>
</li>
<li><a name="'i_sfio'"></a><b><code class="inline"><span class="w">i_sfio</span></code>
</b>
<p>From <i>i_sfio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SFIO</span></code>
symbol,
and indicates whether a C program should include <sfio.h>.</p>
</li>
<li><a name="'i_sgtty'"></a><b><code class="inline"><span class="w">i_sgtty</span></code>
</b>
<p>From <i>i_termio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SGTTY</span></code>
symbol, which
indicates to the C program that it should include <sgtty.h> rather
than <termio.h>.</p>
</li>
<li><a name="'i_shadow'"></a><b><code class="inline"><span class="w">i_shadow</span></code>
</b>
<p>From <i>i_shadow.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SHADOW</span></code>
symbol, and indicates
whether a C program should include <shadow.h>.</p>
</li>
<li><a name="'i_socks'"></a><b><code class="inline"><span class="w">i_socks</span></code>
</b>
<p>From <i>i_socks.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SOCKS</span></code>
symbol, and indicates
whether a C program should include <socks.h>.</p>
</li>
<li><a name="'i_stdarg'"></a><b><code class="inline"><span class="w">i_stdarg</span></code>
</b>
<p>From <i>i_varhdr.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_STDARG</span></code>
symbol, which
indicates to the C program that <stdarg.h> exists and should
be included.</p>
</li>
<li><a name="'i_stddef'"></a><b><code class="inline"><span class="w">i_stddef</span></code>
</b>
<p>From <i>i_stddef.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_STDDEF</span></code>
symbol, which
indicates to the C program that <stddef.h> exists and should
be included.</p>
</li>
<li><a name="'i_stdlib'"></a><b><code class="inline"><span class="w">i_stdlib</span></code>
</b>
<p>From <i>i_stdlib.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_STDLIB</span></code>
symbol, which
indicates to the C program that <stdlib.h> exists and should
be included.</p>
</li>
<li><a name="'i_string'"></a><b><code class="inline"><span class="w">i_string</span></code>
</b>
<p>From <i>i_string.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_STRING</span></code>
symbol, which
indicates that <string.h> should be included rather than <strings.h>.</p>
</li>
<li><a name="'i_sunmath'"></a><b><code class="inline"><span class="w">i_sunmath</span></code>
</b>
<p>From <i>i_sunmath.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SUNMATH</span></code>
symbol, and indicates
whether a C program should include <sunmath.h>.</p>
</li>
<li><a name="'i_sysaccess'"></a><b><code class="inline"><span class="w">i_sysaccess</span></code>
</b>
<p>From <i>i_sysaccess.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_ACCESS</span></code>
symbol,
and indicates whether a C program should include <sys/access.h>.</p>
</li>
<li><a name="'i_sysdir'"></a><b><code class="inline"><span class="w">i_sysdir</span></code>
</b>
<p>From <i>i_sysdir.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_DIR</span></code>
symbol, and indicates
whether a C program should include <sys/dir.h>.</p>
</li>
<li><a name="'i_sysfile'"></a><b><code class="inline"><span class="w">i_sysfile</span></code>
</b>
<p>From <i>i_sysfile.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_FILE</span></code>
symbol, and indicates
whether a C program should include <sys/file.h> to get <code class="inline"><span class="w">R_OK</span></code>
and friends.</p>
</li>
<li><a name="'i_sysfilio'"></a><b><code class="inline"><span class="w">i_sysfilio</span></code>
</b>
<p>From <i>i_sysioctl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_FILIO</span></code>
symbol, which
indicates to the C program that <sys/filio.h> exists and should
be included in preference to <sys/ioctl.h>.</p>
</li>
<li><a name="'i_sysin'"></a><b><code class="inline"><span class="w">i_sysin</span></code>
</b>
<p>From <i>i_niin.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_IN</span></code>
, which indicates
to the C program that it should include <sys/in.h> instead of
<netinet/in.h>.</p>
</li>
<li><a name="'i_sysioctl'"></a><b><code class="inline"><span class="w">i_sysioctl</span></code>
</b>
<p>From <i>i_sysioctl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_IOCTL</span></code>
symbol, which
indicates to the C program that <sys/ioctl.h> exists and should
be included.</p>
</li>
<li><a name="'i_syslog'"></a><b><code class="inline"><span class="w">i_syslog</span></code>
</b>
<p>From <i>i_syslog.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSLOG</span></code>
symbol,
and indicates whether a C program should include <syslog.h>.</p>
</li>
<li><a name="'i_sysmman'"></a><b><code class="inline"><span class="w">i_sysmman</span></code>
</b>
<p>From <i>i_sysmman.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_MMAN</span></code>
symbol, and
indicates whether a C program should include <sys/mman.h>.</p>
</li>
<li><a name="'i_sysmode'"></a><b><code class="inline"><span class="w">i_sysmode</span></code>
</b>
<p>From <i>i_sysmode.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSMODE</span></code>
symbol,
and indicates whether a C program should include <sys/mode.h>.</p>
</li>
<li><a name="'i_sysmount'"></a><b><code class="inline"><span class="w">i_sysmount</span></code>
</b>
<p>From <i>i_sysmount.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSMOUNT</span></code>
symbol,
and indicates whether a C program should include <sys/mount.h>.</p>
</li>
<li><a name="'i_sysndir'"></a><b><code class="inline"><span class="w">i_sysndir</span></code>
</b>
<p>From <i>i_sysndir.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_NDIR</span></code>
symbol, and indicates
whether a C program should include <sys/ndir.h>.</p>
</li>
<li><a name="'i_sysparam'"></a><b><code class="inline"><span class="w">i_sysparam</span></code>
</b>
<p>From <i>i_sysparam.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_PARAM</span></code>
symbol, and indicates
whether a C program should include <sys/param.h>.</p>
</li>
<li><a name="'i_sysresrc'"></a><b><code class="inline"><span class="w">i_sysresrc</span></code>
</b>
<p>From <i>i_sysresrc.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_RESOURCE</span></code>
symbol,
and indicates whether a C program should include <sys/resource.h>.</p>
</li>
<li><a name="'i_syssecrt'"></a><b><code class="inline"><span class="w">i_syssecrt</span></code>
</b>
<p>From <i>i_syssecrt.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_SECURITY</span></code>
symbol,
and indicates whether a C program should include <sys/security.h>.</p>
</li>
<li><a name="'i_sysselct'"></a><b><code class="inline"><span class="w">i_sysselct</span></code>
</b>
<p>From <i>i_sysselct.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_SELECT</span></code>
, which indicates
to the C program that it should include <sys/select.h> in order to
get the definition of struct timeval.</p>
</li>
<li><a name="'i_syssockio'"></a><b><code class="inline"><span class="w">i_syssockio</span></code>
</b>
<p>From <i>i_sysioctl.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_SOCKIO</span></code>
to indicate to the
C program that socket ioctl codes may be found in <sys/sockio.h>
instead of <sys/ioctl.h>.</p>
</li>
<li><a name="'i_sysstat'"></a><b><code class="inline"><span class="w">i_sysstat</span></code>
</b>
<p>From <i>i_sysstat.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_STAT</span></code>
symbol,
and indicates whether a C program should include <sys/stat.h>.</p>
</li>
<li><a name="'i_sysstatfs'"></a><b><code class="inline"><span class="w">i_sysstatfs</span></code>
</b>
<p>From <i>i_sysstatfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSSTATFS</span></code>
symbol,
and indicates whether a C program should include <sys/statfs.h>.</p>
</li>
<li><a name="'i_sysstatvfs'"></a><b><code class="inline"><span class="w">i_sysstatvfs</span></code>
</b>
<p>From <i>i_sysstatvfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSSTATVFS</span></code>
symbol,
and indicates whether a C program should include <sys/statvfs.h>.</p>
</li>
<li><a name="'i_systime'"></a><b><code class="inline"><span class="w">i_systime</span></code>
</b>
<p>From <i>i_time.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_TIME</span></code>
, which indicates
to the C program that it should include <sys/time.h>.</p>
</li>
<li><a name="'i_systimek'"></a><b><code class="inline"><span class="w">i_systimek</span></code>
</b>
<p>From <i>i_time.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_TIME_KERNEL</span></code>
, which
indicates to the C program that it should include <sys/time.h>
with <code class="inline"><span class="w">KERNEL</span></code>
defined.</p>
</li>
<li><a name="'i_systimes'"></a><b><code class="inline"><span class="w">i_systimes</span></code>
</b>
<p>From <i>i_systimes.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_TIMES</span></code>
symbol, and indicates
whether a C program should include <sys/times.h>.</p>
</li>
<li><a name="'i_systypes'"></a><b><code class="inline"><span class="w">i_systypes</span></code>
</b>
<p>From <i>i_systypes.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYS_TYPES</span></code>
symbol,
and indicates whether a C program should include <sys/types.h>.</p>
</li>
<li><a name="'i_sysuio'"></a><b><code class="inline"><span class="w">i_sysuio</span></code>
</b>
<p>From <i>i_sysuio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSUIO</span></code>
symbol, and indicates
whether a C program should include <sys/uio.h>.</p>
</li>
<li><a name="'i_sysun'"></a><b><code class="inline"><span class="w">i_sysun</span></code>
</b>
<p>From <i>i_sysun.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_UN</span></code>
, which indicates
to the C program that it should include <sys/un.h> to get <code class="inline"><span class="w">UNIX</span></code>
domain socket definitions.</p>
</li>
<li><a name="'i_sysutsname'"></a><b><code class="inline"><span class="w">i_sysutsname</span></code>
</b>
<p>From <i>i_sysutsname.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSUTSNAME</span></code>
symbol,
and indicates whether a C program should include <sys/utsname.h>.</p>
</li>
<li><a name="'i_sysvfs'"></a><b><code class="inline"><span class="w">i_sysvfs</span></code>
</b>
<p>From <i>i_sysvfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_SYSVFS</span></code>
symbol,
and indicates whether a C program should include <sys/vfs.h>.</p>
</li>
<li><a name="'i_syswait'"></a><b><code class="inline"><span class="w">i_syswait</span></code>
</b>
<p>From <i>i_syswait.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_SYS_WAIT</span></code>
, which indicates
to the C program that it should include <sys/wait.h>.</p>
</li>
<li><a name="'i_termio'"></a><b><code class="inline"><span class="w">i_termio</span></code>
</b>
<p>From <i>i_termio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_TERMIO</span></code>
symbol, which
indicates to the C program that it should include <termio.h> rather
than <sgtty.h>.</p>
</li>
<li><a name="'i_termios'"></a><b><code class="inline"><span class="w">i_termios</span></code>
</b>
<p>From <i>i_termio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_TERMIOS</span></code>
symbol, which
indicates to the C program that the <code class="inline"><span class="w">POSIX</span></code>
<termios.h> file is
to be included.</p>
</li>
<li><a name="'i_time'"></a><b><code class="inline"><span class="w">i_time</span></code>
</b>
<p>From <i>i_time.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_TIME</span></code>
, which indicates
to the C program that it should include <time.h>.</p>
</li>
<li><a name="'i_unistd'"></a><b><code class="inline"><span class="w">i_unistd</span></code>
</b>
<p>From <i>i_unistd.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_UNISTD</span></code>
symbol, and indicates
whether a C program should include <unistd.h>.</p>
</li>
<li><a name="'i_ustat'"></a><b><code class="inline"><span class="w">i_ustat</span></code>
</b>
<p>From <i>i_ustat.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_USTAT</span></code>
symbol, and indicates
whether a C program should include <ustat.h>.</p>
</li>
<li><a name="'i_utime'"></a><b><code class="inline"><span class="w">i_utime</span></code>
</b>
<p>From <i>i_utime.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_UTIME</span></code>
symbol, and indicates
whether a C program should include <utime.h>.</p>
</li>
<li><a name="'i_values'"></a><b><code class="inline"><span class="w">i_values</span></code>
</b>
<p>From <i>i_values.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_VALUES</span></code>
symbol, and indicates
whether a C program may include <values.h> to get symbols like <code class="inline"><span class="w">MAXLONG</span></code>
and friends.</p>
</li>
<li><a name="'i_varargs'"></a><b><code class="inline"><span class="w">i_varargs</span></code>
</b>
<p>From <i>i_varhdr.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">I_VARARGS</span></code>
, which indicates
to the C program that it should include <varargs.h>.</p>
</li>
<li><a name="'i_varhdr'"></a><b><code class="inline"><span class="w">i_varhdr</span></code>
</b>
<p>From <i>i_varhdr.U</i>:</p>
<p>Contains the name of the header to be included to get va_dcl definition.
Typically one of <i>varargs.h</i> or <i>stdarg.h</i>.</p>
</li>
<li><a name="'i_vfork'"></a><b><code class="inline"><span class="w">i_vfork</span></code>
</b>
<p>From <i>i_vfork.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">I_VFORK</span></code>
symbol, and indicates
whether a C program should include <i>vfork.h</i>.</p>
</li>
<li><a name="'ignore_versioned_solibs'"></a><b><code class="inline"><span class="w">ignore_versioned_solibs</span></code>
</b>
<p>From <i>libs.U</i>:</p>
<p>This variable should be non-empty if non-versioned shared
libraries (<i>libfoo.so.x.y</i>) are to be ignored (because they
cannot be linked against).</p>
</li>
<li><a name="'inc_version_list'"></a><b><code class="inline"><span class="w">inc_version_list</span></code>
</b>
<p>From <i>inc_version_list.U</i>:</p>
<p>This variable specifies the list of subdirectories in over
which <i>perl.c</i>:incpush() and <i>lib/lib.pm</i> will automatically
search when adding directories to @<code class="inline"><span class="w">INC</span></code>
. The elements in
the list are separated by spaces. This is only useful
if you have a perl library directory tree structured like the
default one. See <code class="inline"><span class="w">INSTALL</span></code>
for how this works. The versioned
site_perl directory was introduced in 5.005, so that is the
lowest possible value.</p>
<p>This list includes architecture-dependent directories back to
version $api_versionstring (e.g. 5.5.640) and
architecture-independent directories all the way back to
5.005.</p>
</li>
<li><a name="'inc_version_list_init'"></a><b><code class="inline"><span class="w">inc_version_list_init</span></code>
</b>
<p>From <i>inc_version_list.U</i>:</p>
<p>This variable holds the same list as inc_version_list, but
each item is enclosed in double quotes and separated by commas,
suitable for use in the <code class="inline"><span class="w">PERL_INC_VERSION_LIST</span></code>
initialization.</p>
</li>
<li><a name="'incpath'"></a><b><code class="inline"><span class="w">incpath</span></code>
</b>
<p>From <i>usrinc.U</i>:</p>
<p>This variable must preceed the normal include path to get hte
right one, as in <i>$<i>incpath/usr/include</i></i> or <i>$<i>incpath/usr/lib</i></i>.
Value can be "" or <i>/bsd43</i> on mips.</p>
</li>
<li><a name="'inews'"></a><b><code class="inline"><span class="w">inews</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'initialinstalllocation'"></a><b><code class="inline"><span class="w">initialinstalllocation</span></code>
</b>
<p>From <i>bin.U</i>:</p>
<p>When userelocatableinc is true, this variable holds the location
that make install should copy the perl binary to, with all the
run-time relocatable paths calculated from this at install time.
When used, it is initialised to the original value of binexp, and
then binexp is set to <i>.../</i>, as the other binaries are found
relative to the perl binary.</p>
</li>
<li><a name="'installarchlib'"></a><b><code class="inline"><span class="w">installarchlib</span></code>
</b>
<p>From <i>archlib.U</i>:</p>
<p>This variable is really the same as archlibexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installbin'"></a><b><code class="inline"><span class="w">installbin</span></code>
</b>
<p>From <i>bin.U</i>:</p>
<p>This variable is the same as binexp unless <code class="inline"><span class="w">AFS</span></code>
is running in which case
the user is explicitely prompted for it. This variable should always
be used in your makefiles for maximum portability.</p>
</li>
<li><a name="'installhtml1dir'"></a><b><code class="inline"><span class="w">installhtml1dir</span></code>
</b>
<p>From <i>html1dir.U</i>:</p>
<p>This variable is really the same as html1direxp, unless you are
using a different installprefix. For extra portability, you
should only use this variable within your makefiles.</p>
</li>
<li><a name="'installhtml3dir'"></a><b><code class="inline"><span class="w">installhtml3dir</span></code>
</b>
<p>From <i>html3dir.U</i>:</p>
<p>This variable is really the same as html3direxp, unless you are
using a different installprefix. For extra portability, you
should only use this variable within your makefiles.</p>
</li>
<li><a name="'installman1dir'"></a><b><code class="inline"><span class="w">installman1dir</span></code>
</b>
<p>From <i>man1dir.U</i>:</p>
<p>This variable is really the same as man1direxp, unless you are using
<code class="inline"><span class="w">AFS</span></code>
in which case it points to the read/write location whereas
man1direxp only points to the read-only access location. For extra
portability, you should only use this variable within your makefiles.</p>
</li>
<li><a name="'installman3dir'"></a><b><code class="inline"><span class="w">installman3dir</span></code>
</b>
<p>From <i>man3dir.U</i>:</p>
<p>This variable is really the same as man3direxp, unless you are using
<code class="inline"><span class="w">AFS</span></code>
in which case it points to the read/write location whereas
man3direxp only points to the read-only access location. For extra
portability, you should only use this variable within your makefiles.</p>
</li>
<li><a name="'installprefix'"></a><b><code class="inline"><span class="w">installprefix</span></code>
</b>
<p>From <i>installprefix.U</i>:</p>
<p>This variable holds the name of the directory below which
"make install" will install the package. For most users, this
is the same as prefix. However, it is useful for
installing the software into a different (usually temporary)
location after which it can be bundled up and moved somehow
to the final location specified by prefix.</p>
</li>
<li><a name="'installprefixexp'"></a><b><code class="inline"><span class="w">installprefixexp</span></code>
</b>
<p>From <i>installprefix.U</i>:</p>
<p>This variable holds the full absolute path of installprefix
with all <i>~</i>-expansion done.</p>
</li>
<li><a name="'installprivlib'"></a><b><code class="inline"><span class="w">installprivlib</span></code>
</b>
<p>From <i>privlib.U</i>:</p>
<p>This variable is really the same as privlibexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installscript'"></a><b><code class="inline"><span class="w">installscript</span></code>
</b>
<p>From <i>scriptdir.U</i>:</p>
<p>This variable is usually the same as scriptdirexp, unless you are on
a system running <code class="inline"><span class="w">AFS</span></code>
, in which case they may differ slightly. You
should always use this variable within your makefiles for portability.</p>
</li>
<li><a name="'installsitearch'"></a><b><code class="inline"><span class="w">installsitearch</span></code>
</b>
<p>From <i>sitearch.U</i>:</p>
<p>This variable is really the same as sitearchexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installsitebin'"></a><b><code class="inline"><span class="w">installsitebin</span></code>
</b>
<p>From <i>sitebin.U</i>:</p>
<p>This variable is usually the same as sitebinexp, unless you are on
a system running <code class="inline"><span class="w">AFS</span></code>
, in which case they may differ slightly. You
should always use this variable within your makefiles for portability.</p>
</li>
<li><a name="'installsitehtml1dir'"></a><b><code class="inline"><span class="w">installsitehtml1dir</span></code>
</b>
<p>From <i>sitehtml1dir.U</i>:</p>
<p>This variable is really the same as sitehtml1direxp, unless you are using
<code class="inline"><span class="w">AFS</span></code>
in which case it points to the read/write location whereas
html1direxp only points to the read-only access location. For extra
portability, you should only use this variable within your makefiles.</p>
</li>
<li><a name="'installsitehtml3dir'"></a><b><code class="inline"><span class="w">installsitehtml3dir</span></code>
</b>
<p>From <i>sitehtml3dir.U</i>:</p>
<p>This variable is really the same as sitehtml3direxp, unless you are using
<code class="inline"><span class="w">AFS</span></code>
in which case it points to the read/write location whereas
html3direxp only points to the read-only access location. For extra
portability, you should only use this variable within your makefiles.</p>
</li>
<li><a name="'installsitelib'"></a><b><code class="inline"><span class="w">installsitelib</span></code>
</b>
<p>From <i>sitelib.U</i>:</p>
<p>This variable is really the same as sitelibexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installsiteman1dir'"></a><b><code class="inline"><span class="w">installsiteman1dir</span></code>
</b>
<p>From <i>siteman1dir.U</i>:</p>
<p>This variable is really the same as siteman1direxp, unless you are using
<code class="inline"><span class="w">AFS</span></code>
in which case it points to the read/write location whereas
man1direxp only points to the read-only access location. For extra
portability, you should only use this variable within your makefiles.</p>
</li>
<li><a name="'installsiteman3dir'"></a><b><code class="inline"><span class="w">installsiteman3dir</span></code>
</b>
<p>From <i>siteman3dir.U</i>:</p>
<p>This variable is really the same as siteman3direxp, unless you are using
<code class="inline"><span class="w">AFS</span></code>
in which case it points to the read/write location whereas
man3direxp only points to the read-only access location. For extra
portability, you should only use this variable within your makefiles.</p>
</li>
<li><a name="'installsitescript'"></a><b><code class="inline"><span class="w">installsitescript</span></code>
</b>
<p>From <i>sitescript.U</i>:</p>
<p>This variable is usually the same as sitescriptexp, unless you are on
a system running <code class="inline"><span class="w">AFS</span></code>
, in which case they may differ slightly. You
should always use this variable within your makefiles for portability.</p>
</li>
<li><a name="'installstyle'"></a><b><code class="inline"><span class="w">installstyle</span></code>
</b>
<p>From <i>installstyle.U</i>:</p>
<p>This variable describes the <code class="inline"><span class="w">style</span></code>
of the perl installation.
This is intended to be useful for tools that need to
manipulate entire perl distributions. Perl itself doesn't use
this to find its libraries -- the library directories are
stored directly in <i>Config.pm</i>. Currently, there are only two
styles: <code class="inline"><span class="w">lib</span></code>
and <i>lib/perl5</i>. The default library locations
(e.g. privlib, sitelib) are either <i>$prefix/lib</i> or
<i>$prefix/lib/perl5</i>. The former is useful if $prefix is a
directory dedicated to perl (e.g. <i>/opt/perl</i>), while the latter
is useful if $prefix is shared by many packages, e.g. if
$prefix=<i>/usr/local</i>.</p>
<p>Unfortunately, while this <code class="inline"><span class="w">style</span></code>
variable is used to set
defaults for all three directory hierarchies (core, vendor, and
site), there is no guarantee that the same style is actually
appropriate for all those directories. For example, $prefix
might be <i>/opt/perl</i>, but $siteprefix might be <i>/usr/local</i>.
(Perhaps, in retrospect, the <code class="inline"><span class="w">lib</span></code>
style should never have been
supported, but it did seem like a nice idea at the time.)</p>
<p>The situation is even less clear for tools such as MakeMaker
that can be used to install additional modules into
non-standard places. For example, if a user intends to install
a module into a private directory (perhaps by setting <code class="inline"><span class="w">PREFIX</span></code>
on
the <i>Makefile.PL</i> command line), then there is no reason to
assume that the Configure-time $installstyle setting will be
relevant for that <code class="inline"><span class="w">PREFIX</span></code>
.</p>
<p>This may later be extended to include other information, so
be careful with pattern-matching on the results.</p>
<p>For compatibility with <i>perl5.005</i> and earlier, the default
setting is based on whether or not $prefix contains the string
<code class="inline"><span class="w">perl</span></code>
.</p>
</li>
<li><a name="'installusrbinperl'"></a><b><code class="inline"><span class="w">installusrbinperl</span></code>
</b>
<p>From <i>instubperl.U</i>:</p>
<p>This variable tells whether Perl should be installed also as
<i>/usr/bin/perl</i> in addition to
<i>$installbin/perl</i></p>
</li>
<li><a name="'installvendorarch'"></a><b><code class="inline"><span class="w">installvendorarch</span></code>
</b>
<p>From <i>vendorarch.U</i>:</p>
<p>This variable is really the same as vendorarchexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorbin'"></a><b><code class="inline"><span class="w">installvendorbin</span></code>
</b>
<p>From <i>vendorbin.U</i>:</p>
<p>This variable is really the same as vendorbinexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorhtml1dir'"></a><b><code class="inline"><span class="w">installvendorhtml1dir</span></code>
</b>
<p>From <i>vendorhtml1dir.U</i>:</p>
<p>This variable is really the same as vendorhtml1direxp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorhtml3dir'"></a><b><code class="inline"><span class="w">installvendorhtml3dir</span></code>
</b>
<p>From <i>vendorhtml3dir.U</i>:</p>
<p>This variable is really the same as vendorhtml3direxp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorlib'"></a><b><code class="inline"><span class="w">installvendorlib</span></code>
</b>
<p>From <i>vendorlib.U</i>:</p>
<p>This variable is really the same as vendorlibexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorman1dir'"></a><b><code class="inline"><span class="w">installvendorman1dir</span></code>
</b>
<p>From <i>vendorman1dir.U</i>:</p>
<p>This variable is really the same as vendorman1direxp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorman3dir'"></a><b><code class="inline"><span class="w">installvendorman3dir</span></code>
</b>
<p>From <i>vendorman3dir.U</i>:</p>
<p>This variable is really the same as vendorman3direxp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'installvendorscript'"></a><b><code class="inline"><span class="w">installvendorscript</span></code>
</b>
<p>From <i>vendorscript.U</i>:</p>
<p>This variable is really the same as vendorscriptexp but may differ on
those systems using <code class="inline"><span class="w">AFS</span></code>
. For extra portability, only this variable
should be used in makefiles.</p>
</li>
<li><a name="'intsize'"></a><b><code class="inline"><span class="w">intsize</span></code>
</b>
<p>From <i>intsize.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">INTSIZE</span></code>
symbol, which
indicates to the C program how many bytes there are in an int.</p>
</li>
<li><a name="'issymlink'"></a><b><code class="inline"><span class="w">issymlink</span></code>
</b>
<p>From <i>issymlink.U</i>:</p>
<p>This variable holds the test command to test for a symbolic link
(if they are supported). Typical values include <code class="inline"><span class="w">test</span> -<span class="w">h</span></code>
and
<code class="inline"><span class="w">test</span> -<span class="w">L</span></code>
.</p>
</li>
<li><a name="'ivdformat'"></a><b><code class="inline"><span class="w">ivdformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">IV</span></code>
as a signed decimal integer.</p>
</li>
<li><a name="'ivsize'"></a><b><code class="inline"><span class="w">ivsize</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an <code class="inline"><span class="w">IV</span></code>
in bytes.</p>
</li>
<li><a name="'ivtype'"></a><b><code class="inline"><span class="w">ivtype</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's <code class="inline"><span class="w">IV</span></code>
.</p>
</li>
</ul>
<a name="k"></a><h2>k</h2>
<ul>
<li><a name="'known_extensions'"></a><b><code class="inline"><span class="w">known_extensions</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds a list of all <code class="inline"><span class="w">XS</span></code>
extensions included in
the package.</p>
</li>
<li><a name="'ksh'"></a><b><code class="inline"><span class="w">ksh</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
</ul>
<a name="l"></a><h2>l</h2>
<ul>
<li><a name="'ld'"></a><b><code class="inline"><span class="w">ld</span></code>
</b>
<p>From <i>dlsrc.U</i>:</p>
<p>This variable indicates the program to be used to link
libraries for dynamic loading. On some systems, it is <code class="inline"><span class="w">ld</span></code>
.
On <code class="inline"><span class="w">ELF</span></code>
systems, it should be $cc. Mostly, we'll try to respect
the hint file setting.</p>
</li>
<li><a name="'lddlflags'"></a><b><code class="inline"><span class="w">lddlflags</span></code>
</b>
<p>From <i>dlsrc.U</i>:</p>
<p>This variable contains any special flags that might need to be
passed to $ld to create a shared library suitable for dynamic
loading. It is up to the makefile to use it. For hpux, it
should be <code class="inline">-b</code>
. For sunos 4.1, it is empty.</p>
</li>
<li><a name="'ldflags'"></a><b><code class="inline"><span class="w">ldflags</span></code>
</b>
<p>From <i>ccflags.U</i>:</p>
<p>This variable contains any additional C loader flags desired by
the user. It is up to the Makefile to use this.</p>
</li>
<li><a name="'ldflags_uselargefiles'"></a><b><code class="inline"><span class="w">ldflags_uselargefiles</span></code>
</b>
<p>From <i>uselfs.U</i>:</p>
<p>This variable contains the loader flags needed by large file builds
and added to ldflags by hints files.</p>
</li>
<li><a name="'ldlibpthname'"></a><b><code class="inline"><span class="w">ldlibpthname</span></code>
</b>
<p>From <i>libperl.U</i>:</p>
<p>This variable holds the name of the shared library
search path, often <code class="inline"><span class="w">LD_LIBRARY_PATH</span></code>
. To get an empty
string, the hints file must set this to <code class="inline"><span class="w">none</span></code>
.</p>
</li>
<li><a name="'less'"></a><b><code class="inline"><span class="w">less</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the less program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">less</span></code>
and is not useful.</p>
</li>
<li><a name="'lib_ext'"></a><b><code class="inline"><span class="w">lib_ext</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This is an old synonym for _a.</p>
</li>
<li><a name="'libc'"></a><b><code class="inline"><span class="w">libc</span></code>
</b>
<p>From <i>libc.U</i>:</p>
<p>This variable contains the location of the C library.</p>
</li>
<li><a name="'libperl'"></a><b><code class="inline"><span class="w">libperl</span></code>
</b>
<p>From <i>libperl.U</i>:</p>
<p>The perl executable is obtained by linking <i>perlmain.c</i> with
libperl, any static extensions (usually just DynaLoader),
and any other libraries needed on this system. libperl
is usually <i>libperl.a</i>, but can also be <i>libperl.so.xxx</i> if
the user wishes to build a perl executable with a shared
library.</p>
</li>
<li><a name="'libpth'"></a><b><code class="inline"><span class="w">libpth</span></code>
</b>
<p>From <i>libpth.U</i>:</p>
<p>This variable holds the general path (space-separated) used to find
libraries. It is intended to be used by other units.</p>
</li>
<li><a name="'libs'"></a><b><code class="inline"><span class="w">libs</span></code>
</b>
<p>From <i>libs.U</i>:</p>
<p>This variable holds the additional libraries we want to use.
It is up to the Makefile to deal with it. The list can be empty.</p>
</li>
<li><a name="'libsdirs'"></a><b><code class="inline"><span class="w">libsdirs</span></code>
</b>
<p>From <i>libs.U</i>:</p>
<p>This variable holds the directory names aka dirnames of the libraries
we found and accepted, duplicates are removed.</p>
</li>
<li><a name="'libsfiles'"></a><b><code class="inline"><span class="w">libsfiles</span></code>
</b>
<p>From <i>libs.U</i>:</p>
<p>This variable holds the filenames aka basenames of the libraries
we found and accepted.</p>
</li>
<li><a name="'libsfound'"></a><b><code class="inline"><span class="w">libsfound</span></code>
</b>
<p>From <i>libs.U</i>:</p>
<p>This variable holds the full pathnames of the libraries
we found and accepted.</p>
</li>
<li><a name="'libspath'"></a><b><code class="inline"><span class="w">libspath</span></code>
</b>
<p>From <i>libs.U</i>:</p>
<p>This variable holds the directory names probed for libraries.</p>
</li>
<li><a name="'libswanted'"></a><b><code class="inline"><span class="w">libswanted</span></code>
</b>
<p>From <i>Myinit.U</i>:</p>
<p>This variable holds a list of all the libraries we want to
search. The order is chosen to pick up the c library
ahead of ucb or bsd libraries for SVR4.</p>
</li>
<li><a name="'libswanted_uselargefiles'"></a><b><code class="inline"><span class="w">libswanted_uselargefiles</span></code>
</b>
<p>From <i>uselfs.U</i>:</p>
<p>This variable contains the libraries needed by large file builds
and added to ldflags by hints files. It is a space separated list
of the library names without the <code class="inline"><span class="w">lib</span></code>
prefix or any suffix, just
like <i>libswanted.</i>.</p>
</li>
<li><a name="'line'"></a><b><code class="inline"><span class="w">line</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'lint'"></a><b><code class="inline"><span class="w">lint</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'lkflags'"></a><b><code class="inline"><span class="w">lkflags</span></code>
</b>
<p>From <i>ccflags.U</i>:</p>
<p>This variable contains any additional C partial linker flags desired by
the user. It is up to the Makefile to use this.</p>
</li>
<li><a name="'ln'"></a><b><code class="inline"><span class="w">ln</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the ln program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">ln</span></code>
and is not useful.</p>
</li>
<li><a name="'lns'"></a><b><code class="inline"><span class="w">lns</span></code>
</b>
<p>From <i>lns.U</i>:</p>
<p>This variable holds the name of the command to make
symbolic links (if they are supported). It can be used
in the Makefile. It is either <code class="inline"><span class="w">ln</span> -s</code>
or <code class="inline"><span class="w">ln</span></code>
</p>
</li>
<li><a name="'localtime_r_proto'"></a><b><code class="inline"><span class="w">localtime_r_proto</span></code>
</b>
<p>From <i>d_localtime_r.U</i>:</p>
<p>This variable encodes the prototype of localtime_r.
It is zero if d_localtime_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_localtime_r
is defined.</p>
</li>
<li><a name="'locincpth'"></a><b><code class="inline"><span class="w">locincpth</span></code>
</b>
<p>From <i>ccflags.U</i>:</p>
<p>This variable contains a list of additional directories to be
searched by the compiler. The appropriate <code class="inline">-<span class="w">I</span></code>
directives will
be added to ccflags. This is intended to simplify setting
local directories from the Configure command line.
It's not much, but it parallels the loclibpth stuff in <i>libpth.U</i>.</p>
</li>
<li><a name="'loclibpth'"></a><b><code class="inline"><span class="w">loclibpth</span></code>
</b>
<p>From <i>libpth.U</i>:</p>
<p>This variable holds the paths (space-separated) used to find local
libraries. It is prepended to libpth, and is intended to be easily
set from the command line.</p>
</li>
<li><a name="'longdblsize'"></a><b><code class="inline"><span class="w">longdblsize</span></code>
</b>
<p>From <i>d_longdbl.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">LONG_DOUBLESIZE</span></code>
symbol, which
indicates to the C program how many bytes there are in a long double,
if this system supports long doubles.</p>
</li>
<li><a name="'longlongsize'"></a><b><code class="inline"><span class="w">longlongsize</span></code>
</b>
<p>From <i>d_longlong.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">LONGLONGSIZE</span></code>
symbol, which
indicates to the C program how many bytes there are in a long long,
if this system supports long long.</p>
</li>
<li><a name="'longsize'"></a><b><code class="inline"><span class="w">longsize</span></code>
</b>
<p>From <i>intsize.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">LONGSIZE</span></code>
symbol, which
indicates to the C program how many bytes there are in a long.</p>
</li>
<li><a name="'lp'"></a><b><code class="inline"><span class="w">lp</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'lpr'"></a><b><code class="inline"><span class="w">lpr</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'ls'"></a><b><code class="inline"><span class="w">ls</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the ls program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">ls</span></code>
and is not useful.</p>
</li>
<li><a name="'lseeksize'"></a><b><code class="inline"><span class="w">lseeksize</span></code>
</b>
<p>From <i>lseektype.U</i>:</p>
<p>This variable defines lseektype to be something like off_t, long,
or whatever type is used to declare lseek offset's type in the
kernel (which also appears to be lseek's return type).</p>
</li>
<li><a name="'lseektype'"></a><b><code class="inline"><span class="w">lseektype</span></code>
</b>
<p>From <i>lseektype.U</i>:</p>
<p>This variable defines lseektype to be something like off_t, long,
or whatever type is used to declare lseek offset's type in the
kernel (which also appears to be lseek's return type).</p>
</li>
</ul>
<a name="m"></a><h2>m</h2>
<ul>
<li><a name="'mad'"></a><b><code class="inline"><span class="w">mad</span></code>
</b>
<p>From <i>mad.U</i>:</p>
<p>This variable indicates that the Misc Attribute Definition code is to
be compiled.</p>
</li>
<li><a name="'madlyh'"></a><b><code class="inline"><span class="w">madlyh</span></code>
</b>
<p>From <i>mad.U</i>:</p>
<p>If the Misc Attribute Decoration is to be compiled, this variable is
set to the name of the extra header files to be used, else it is ''</p>
</li>
<li><a name="'madlyobj'"></a><b><code class="inline"><span class="w">madlyobj</span></code>
</b>
<p>From <i>mad.U</i>:</p>
<p>If the Misc Attribute Decoration is to be compiled, this variable is
set to the name of the extra object files to be used, else it is ''</p>
</li>
<li><a name="'madlysrc'"></a><b><code class="inline"><span class="w">madlysrc</span></code>
</b>
<p>From <i>mad.U</i>:</p>
<p>If the Misc Attribute Decoration is to be compiled, this variable is
set to the name of the extra C source files to be used, else it is ''</p>
</li>
<li><a name="'mail'"></a><b><code class="inline"><span class="w">mail</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'mailx'"></a><b><code class="inline"><span class="w">mailx</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'make'"></a><b><code class="inline"><span class="w">make</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the make program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">make</span></code>
and is not useful.</p>
</li>
<li><a name="'make_set_make'"></a><b><code class="inline"><span class="w">make_set_make</span></code>
</b>
<p>From <i>make.U</i>:</p>
<p>Some versions of <code class="inline"><span class="w">make</span></code>
set the variable <code class="inline"><span class="w">MAKE</span></code>
. Others do not.
This variable contains the string to be included in <i>Makefile.SH</i>
so that <code class="inline"><span class="w">MAKE</span></code>
is set if needed, and not if not needed.
Possible values are:</p>
<p>make_set_make=<code class="inline"><span class="c">#</span></code>
# If your make program handles this for you,</p>
<p>make_set_make=<code class="inline"><span class="w">MAKE</span>=<span class="i">$make</span></code>
# if it doesn't.</p>
<p>This uses a comment character to distinguish a
<code class="inline"><span class="w">set</span></code>
value (from a previous <i>config.sh</i> or Configure <code class="inline">-<span class="w">D</span></code>
option)
from an uncomputed value.</p>
</li>
<li><a name="'mallocobj'"></a><b><code class="inline"><span class="w">mallocobj</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable contains the name of the <i>malloc.o</i> that this package
generates, if that <i>malloc.o</i> is preferred over the system malloc.
Otherwise the value is null. This variable is intended for generating
Makefiles. See mallocsrc.</p>
</li>
<li><a name="'mallocsrc'"></a><b><code class="inline"><span class="w">mallocsrc</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable contains the name of the <i>malloc.c</i> that comes with
the package, if that <i>malloc.c</i> is preferred over the system malloc.
Otherwise the value is null. This variable is intended for generating
Makefiles.</p>
</li>
<li><a name="'malloctype'"></a><b><code class="inline"><span class="w">malloctype</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable contains the kind of ptr returned by malloc and realloc.</p>
</li>
<li><a name="'man1dir'"></a><b><code class="inline"><span class="w">man1dir</span></code>
</b>
<p>From <i>man1dir.U</i>:</p>
<p>This variable contains the name of the directory in which manual
source pages are to be put. It is the responsibility of the
<i>Makefile.SH</i> to get the value of this into the proper command.
You must be prepared to do the <i>~name</i> expansion yourself.</p>
</li>
<li><a name="'man1direxp'"></a><b><code class="inline"><span class="w">man1direxp</span></code>
</b>
<p>From <i>man1dir.U</i>:</p>
<p>This variable is the same as the man1dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'man1ext'"></a><b><code class="inline"><span class="w">man1ext</span></code>
</b>
<p>From <i>man1dir.U</i>:</p>
<p>This variable contains the extension that the manual page should
have: one of <code class="inline"><span class="w">n</span></code>
, <code class="inline"><span class="w">l</span></code>
, or <code class="inline"><span class="n">1</span></code>
. The Makefile must supply the <i>.</i>.
See man1dir.</p>
</li>
<li><a name="'man3dir'"></a><b><code class="inline"><span class="w">man3dir</span></code>
</b>
<p>From <i>man3dir.U</i>:</p>
<p>This variable contains the name of the directory in which manual
source pages are to be put. It is the responsibility of the
<i>Makefile.SH</i> to get the value of this into the proper command.
You must be prepared to do the <i>~name</i> expansion yourself.</p>
</li>
<li><a name="'man3direxp'"></a><b><code class="inline"><span class="w">man3direxp</span></code>
</b>
<p>From <i>man3dir.U</i>:</p>
<p>This variable is the same as the man3dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'man3ext'"></a><b><code class="inline"><span class="w">man3ext</span></code>
</b>
<p>From <i>man3dir.U</i>:</p>
<p>This variable contains the extension that the manual page should
have: one of <code class="inline"><span class="w">n</span></code>
, <code class="inline"><span class="w">l</span></code>
, or <code class="inline"><span class="n">3</span></code>
. The Makefile must supply the <i>.</i>.
See man3dir.</p>
</li>
</ul>
<a name="M"></a><h2>M</h2>
<ul>
<li><a name="'Mcc'"></a><b><code class="inline"><span class="w">Mcc</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the Mcc program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">Mcc</span></code>
and is not useful.</p>
</li>
<li><a name="'mips_type'"></a><b><code class="inline"><span class="w">mips_type</span></code>
</b>
<p>From <i>usrinc.U</i>:</p>
<p>This variable holds the environment type for the mips system.
Possible values are "BSD 4.3" and "System V".</p>
</li>
<li><a name="'mistrustnm'"></a><b><code class="inline"><span class="w">mistrustnm</span></code>
</b>
<p>From <i>Csym.U</i>:</p>
<p>This variable can be used to establish a fallthrough for the cases
where nm fails to find a symbol. If usenm is false or usenm is true
and mistrustnm is false, this variable has no effect. If usenm is true
and mistrustnm is <code class="inline"><span class="w">compile</span></code>
, a test program will be compiled to try to
find any symbol that can't be located via nm lookup. If mistrustnm is
<code class="inline"><span class="w">run</span></code>
, the test program will be run as well as being compiled.</p>
</li>
<li><a name="'mkdir'"></a><b><code class="inline"><a class="l_k" href="functions/mkdir.html">mkdir</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the mkdir program. After Configure runs,
the value is reset to a plain <code class="inline"><a class="l_k" href="functions/mkdir.html">mkdir</a></code> and is not useful.</p>
</li>
<li><a name="'mmaptype'"></a><b><code class="inline"><span class="w">mmaptype</span></code>
</b>
<p>From <i>d_mmap.U</i>:</p>
<p>This symbol contains the type of pointer returned by mmap()
(and simultaneously the type of the first argument).
It can be <code class="inline"><span class="w">void</span> *</code>
or <code class="inline"><span class="w">caddr_t</span></code>
.</p>
</li>
<li><a name="'modetype'"></a><b><code class="inline"><span class="w">modetype</span></code>
</b>
<p>From <i>modetype.U</i>:</p>
<p>This variable defines modetype to be something like mode_t,
int, unsigned short, or whatever type is used to declare file
modes for system calls.</p>
</li>
<li><a name="'more'"></a><b><code class="inline"><span class="w">more</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the more program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">more</span></code>
and is not useful.</p>
</li>
<li><a name="'multiarch'"></a><b><code class="inline"><span class="w">multiarch</span></code>
</b>
<p>From <i>multiarch.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">MULTIARCH</span></code>
symbol
which signifies the presence of multiplatform files.
This is normally set by hints files.</p>
</li>
<li><a name="'mv'"></a><b><code class="inline"><span class="w">mv</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'myarchname'"></a><b><code class="inline"><span class="w">myarchname</span></code>
</b>
<p>From <i>archname.U</i>:</p>
<p>This variable holds the architecture name computed by Configure in
a previous run. It is not intended to be perused by any user and
should never be set in a hint file.</p>
</li>
<li><a name="'mydomain'"></a><b><code class="inline"><span class="w">mydomain</span></code>
</b>
<p>From <i>myhostname.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">MYDOMAIN</span></code>
symbol,
which is the domain of the host the program is going to run on.
The domain must be appended to myhostname to form a complete host name.
The dot comes with mydomain, and need not be supplied by the program.</p>
</li>
<li><a name="'myhostname'"></a><b><code class="inline"><span class="w">myhostname</span></code>
</b>
<p>From <i>myhostname.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">MYHOSTNAME</span></code>
symbol,
which is the name of the host the program is going to run on.
The domain is not kept with hostname, but must be gotten from mydomain.
The dot comes with mydomain, and need not be supplied by the program.</p>
</li>
<li><a name="'myuname'"></a><b><code class="inline"><span class="w">myuname</span></code>
</b>
<p>From <i>Oldconfig.U</i>:</p>
<p>The output of <code class="inline"><span class="w">uname</span> -<span class="w">a</span></code>
if available, otherwise the hostname. On Xenix,
pseudo variables assignments in the output are stripped, thank you. The
whole thing is then lower-cased.</p>
</li>
</ul>
<a name="n"></a><h2>n</h2>
<ul>
<li><a name="'n'"></a><b><code class="inline"><span class="w">n</span></code>
</b>
<p>From <i>n.U</i>:</p>
<p>This variable contains the <code class="inline">-<span class="w">n</span></code>
flag if that is what causes the echo
command to suppress newline. Otherwise it is null. Correct usage is
$echo $n "prompt for a question: $c".</p>
</li>
<li><a name="'need_va_copy'"></a><b><code class="inline"><span class="w">need_va_copy</span></code>
</b>
<p>From <i>need_va_copy.U</i>:</p>
<p>This symbol, if defined, indicates that the system stores
the variable argument list datatype, va_list, in a format
that cannot be copied by simple assignment, so that some
other means must be used when copying is required.
As such systems vary in their provision (or non-provision)
of copying mechanisms, <i>handy.h</i> defines a platform-
<code class="inline"><span class="w">independent</span></code>
macro, Perl_va_copy(src, dst), to do the job.</p>
</li>
<li><a name="'netdb_hlen_type'"></a><b><code class="inline"><span class="w">netdb_hlen_type</span></code>
</b>
<p>From <i>netdbtype.U</i>:</p>
<p>This variable holds the type used for the 2nd argument to
gethostbyaddr(). Usually, this is int or size_t or unsigned.
This is only useful if you have gethostbyaddr(), naturally.</p>
</li>
<li><a name="'netdb_host_type'"></a><b><code class="inline"><span class="w">netdb_host_type</span></code>
</b>
<p>From <i>netdbtype.U</i>:</p>
<p>This variable holds the type used for the 1st argument to
gethostbyaddr(). Usually, this is char * or void *, possibly
with or without a const prefix.
This is only useful if you have gethostbyaddr(), naturally.</p>
</li>
<li><a name="'netdb_name_type'"></a><b><code class="inline"><span class="w">netdb_name_type</span></code>
</b>
<p>From <i>netdbtype.U</i>:</p>
<p>This variable holds the type used for the argument to
gethostbyname(). Usually, this is char * or const char *.
This is only useful if you have gethostbyname(), naturally.</p>
</li>
<li><a name="'netdb_net_type'"></a><b><code class="inline"><span class="w">netdb_net_type</span></code>
</b>
<p>From <i>netdbtype.U</i>:</p>
<p>This variable holds the type used for the 1st argument to
getnetbyaddr(). Usually, this is int or long.
This is only useful if you have getnetbyaddr(), naturally.</p>
</li>
<li><a name="'nm'"></a><b><code class="inline"><span class="w">nm</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the nm program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">nm</span></code>
and is not useful.</p>
</li>
<li><a name="'nm_opt'"></a><b><code class="inline"><span class="w">nm_opt</span></code>
</b>
<p>From <i>usenm.U</i>:</p>
<p>This variable holds the options that may be necessary for nm.</p>
</li>
<li><a name="'nm_so_opt'"></a><b><code class="inline"><span class="w">nm_so_opt</span></code>
</b>
<p>From <i>usenm.U</i>:</p>
<p>This variable holds the options that may be necessary for nm
to work on a shared library but that can not be used on an
archive library. Currently, this is only used by Linux, where
nm --dynamic is *required* to get symbols from an <code class="inline"><span class="w">ELF</span></code>
library which
has been stripped, but nm --dynamic is *fatal* on an archive library.
Maybe Linux should just always set usenm=false.</p>
</li>
<li><a name="'nonxs_ext'"></a><b><code class="inline"><span class="w">nonxs_ext</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds a list of all non-xs extensions included
in the package. All of them will be built.</p>
</li>
<li><a name="'nroff'"></a><b><code class="inline"><span class="w">nroff</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the nroff program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">nroff</span></code>
and is not useful.</p>
</li>
<li><a name="'nv_preserves_uv_bits'"></a><b><code class="inline"><span class="w">nv_preserves_uv_bits</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable indicates how many of bits type uvtype
a variable nvtype can preserve.</p>
</li>
<li><a name="'nveformat'"></a><b><code class="inline"><span class="w">nveformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">NV</span></code>
using %e-ish floating point format.</p>
</li>
<li><a name="'nvEUformat'"></a><b><code class="inline"><span class="w">nvEUformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">NV</span></code>
using %E-ish floating point format.</p>
</li>
<li><a name="'nvfformat'"></a><b><code class="inline"><span class="w">nvfformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable confains the format string used for printing
a Perl <code class="inline"><span class="w">NV</span></code>
using %f-ish floating point format.</p>
</li>
<li><a name="'nvFUformat'"></a><b><code class="inline"><span class="w">nvFUformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable confains the format string used for printing
a Perl <code class="inline"><span class="w">NV</span></code>
using %F-ish floating point format.</p>
</li>
<li><a name="'nvgformat'"></a><b><code class="inline"><span class="w">nvgformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">NV</span></code>
using %g-ish floating point format.</p>
</li>
<li><a name="'nvGUformat'"></a><b><code class="inline"><span class="w">nvGUformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">NV</span></code>
using %G-ish floating point format.</p>
</li>
<li><a name="'nvsize'"></a><b><code class="inline"><span class="w">nvsize</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an <code class="inline"><span class="w">NV</span></code>
in bytes.</p>
</li>
<li><a name="'nvtype'"></a><b><code class="inline"><span class="w">nvtype</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's <code class="inline"><span class="w">NV</span></code>
.</p>
</li>
</ul>
<a name="o"></a><h2>o</h2>
<ul>
<li><a name="'o_nonblock'"></a><b><code class="inline"><span class="w">o_nonblock</span></code>
</b>
<p>From <i>nblock_io.U</i>:</p>
<p>This variable bears the symbol value to be used during open() or fcntl()
to turn on non-blocking I/O for a file descriptor. If you wish to switch
between blocking and non-blocking, you may try ioctl(<code class="inline"><span class="w">FIOSNBIO</span></code>
) instead,
but that is only supported by some devices.</p>
</li>
<li><a name="'obj_ext'"></a><b><code class="inline"><span class="w">obj_ext</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This is an old synonym for _o.</p>
</li>
<li><a name="'old_pthread_create_joinable'"></a><b><code class="inline"><span class="w">old_pthread_create_joinable</span></code>
</b>
<p>From <i>d_pthrattrj.U</i>:</p>
<p>This variable defines the constant to use for creating joinable
(aka undetached) pthreads. Unused if <i>pthread.h</i> defines
<code class="inline"><span class="w">PTHREAD_CREATE_JOINABLE</span></code>
. If used, possible values are
<code class="inline"><span class="w">PTHREAD_CREATE_UNDETACHED</span></code>
and <code class="inline"><span class="w">__UNDETACHED</span></code>
.</p>
</li>
<li><a name="'optimize'"></a><b><code class="inline"><span class="w">optimize</span></code>
</b>
<p>From <i>ccflags.U</i>:</p>
<p>This variable contains any <i>optimizer/debugger</i> flag that should be used.
It is up to the Makefile to use it.</p>
</li>
<li><a name="'orderlib'"></a><b><code class="inline"><span class="w">orderlib</span></code>
</b>
<p>From <i>orderlib.U</i>:</p>
<p>This variable is <code class="inline"><span class="w">true</span></code>
if the components of libraries must be ordered
(with `lorder $* | tsort`) before placing them in an archive. Set to
<code class="inline"><span class="w">false</span></code>
if ranlib or ar can generate random libraries.</p>
</li>
<li><a name="'osname'"></a><b><code class="inline"><span class="w">osname</span></code>
</b>
<p>From <i>Oldconfig.U</i>:</p>
<p>This variable contains the operating system name (e.g. sunos,
solaris, hpux, etc.). It can be useful later on for setting
defaults. Any spaces are replaced with underscores. It is set
to a null string if we can't figure it out.</p>
</li>
<li><a name="'osvers'"></a><b><code class="inline"><span class="w">osvers</span></code>
</b>
<p>From <i>Oldconfig.U</i>:</p>
<p>This variable contains the operating system version (e.g.
4.1.3, 5.2, etc.). It is primarily used for helping select
an appropriate hints file, but might be useful elsewhere for
setting defaults. It is set to '' if we can't figure it out.
We try to be flexible about how much of the version number
to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the
same for this package, hints files might just be <i>os_4.0</i> or
<i>os_4.1</i>, etc., not keeping separate files for each little release.</p>
</li>
<li><a name="'otherlibdirs'"></a><b><code class="inline"><span class="w">otherlibdirs</span></code>
</b>
<p>From <i>otherlibdirs.U</i>:</p>
<p>This variable contains a colon-separated set of paths for the perl
binary to search for additional library files or modules.
These directories will be tacked to the end of @<code class="inline"><span class="w">INC</span></code>
.
Perl will automatically search below each path for version-
and architecture-specific directories. See inc_version_list
for more details.
A value of <code class="inline"> </code>
means <code class="inline"><span class="w">none</span></code>
and is used to preserve this value
for the next run through Configure.</p>
</li>
</ul>
<a name="p"></a><h2>p</h2>
<ul>
<li><a name="'package'"></a><b><code class="inline"><a class="l_k" href="functions/package.html">package</a></code></b>
<p>From <i>package.U</i>:</p>
<p>This variable contains the name of the package being constructed.
It is primarily intended for the use of later Configure units.</p>
</li>
<li><a name="'pager'"></a><b><code class="inline"><span class="w">pager</span></code>
</b>
<p>From <i>pager.U</i>:</p>
<p>This variable contains the name of the preferred pager on the system.
Usual values are (the full pathnames of) more, less, pg, or cat.</p>
</li>
<li><a name="'passcat'"></a><b><code class="inline"><span class="w">passcat</span></code>
</b>
<p>From <i>nis.U</i>:</p>
<p>This variable contains a command that produces the text of the
<i>/etc/passwd</i> file. This is normally "cat <i>/etc/passwd</i>", but can be
"ypcat passwd" when <code class="inline"><span class="w">NIS</span></code>
is used.
On some systems, such as os390, there may be no equivalent
command, in which case this variable is unset.</p>
</li>
<li><a name="'patchlevel'"></a><b><code class="inline"><span class="w">patchlevel</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The patchlevel level of this package.
The value of patchlevel comes from the <i>patchlevel.h</i> file.
In a version number such as 5.6.1, this is the <code class="inline"><span class="n">6</span></code>
.
In <i>patchlevel.h</i>, this is referred to as <code class="inline"><span class="w">PERL_VERSION</span></code>
.</p>
</li>
<li><a name="'path_sep'"></a><b><code class="inline"><span class="w">path_sep</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This is an old synonym for p_ in <i>Head.U</i>, the character
used to separate elements in the command shell search <code class="inline"><span class="w">PATH</span></code>
.</p>
</li>
<li><a name="'perl'"></a><b><code class="inline"><span class="w">perl</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'perl5'"></a><b><code class="inline"><span class="w">perl5</span></code>
</b>
<p>From <i>perl5.U</i>:</p>
<p>This variable contains the full path (if any) to a previously
installed <i>perl5.005</i> or later suitable for running the script
to determine inc_version_list.</p>
</li>
</ul>
<a name="P"></a><h2>P</h2>
<ul>
<li><a name="'PERL_API_REVISION'"></a><b><code class="inline"><span class="w">PERL_API_REVISION</span></code>
</b>
<p>From <i>patchlevel.h</i>:</p>
<p>This number describes the earliest compatible <code class="inline"><span class="w">PERL_REVISION</span></code>
of
Perl (<code class="inline"><span class="w">compatibility</span></code>
here being defined as sufficient <i>binary/<code class="inline"><span class="w">API</span></code>
</i>
compatibility to run <code class="inline"><span class="w">XS</span></code>
code built with the older version).
Normally this does not change across maintenance releases.
Please read the comment in <i>patchlevel.h</i>.</p>
</li>
<li><a name="'PERL_API_SUBVERSION'"></a><b><code class="inline"><span class="w">PERL_API_SUBVERSION</span></code>
</b>
<p>From <i>patchlevel.h</i>:</p>
<p>This number describes the earliest compatible <code class="inline"><span class="w">PERL_SUBVERSION</span></code>
of
Perl (<code class="inline"><span class="w">compatibility</span></code>
here being defined as sufficient <i>binary/<code class="inline"><span class="w">API</span></code>
</i>
compatibility to run <code class="inline"><span class="w">XS</span></code>
code built with the older version).
Normally this does not change across maintenance releases.
Please read the comment in <i>patchlevel.h</i>.</p>
</li>
<li><a name="'PERL_API_VERSION'"></a><b><code class="inline"><span class="w">PERL_API_VERSION</span></code>
</b>
<p>From <i>patchlevel.h</i>:</p>
<p>This number describes the earliest compatible <code class="inline"><span class="w">PERL_VERSION</span></code>
of
Perl (<code class="inline"><span class="w">compatibility</span></code>
here being defined as sufficient <i>binary/<code class="inline"><span class="w">API</span></code>
</i>
compatibility to run <code class="inline"><span class="w">XS</span></code>
code built with the older version).
Normally this does not change across maintenance releases.
Please read the comment in <i>patchlevel.h</i>.</p>
</li>
<li><a name="'PERL_CONFIG_SH'"></a><b><code class="inline"><span class="w">PERL_CONFIG_SH</span></code>
</b>
<p>From <i>Oldsyms.U</i>:</p>
<p>This is set to <code class="inline"><span class="w">true</span></code>
in <i>config.sh</i> so that a shell script
sourcing <i>config.sh</i> can tell if it has been sourced already.</p>
</li>
<li><a name="'PERL_PATCHLEVEL'"></a><b><code class="inline"><span class="w">PERL_PATCHLEVEL</span></code>
</b>
<p>From <i>Oldsyms.U</i>:</p>
<p>This symbol reflects the patchlevel, if available. Will usually
come from the <i>.patch</i> file, which is available when the perl
source tree was fetched with rsync.</p>
</li>
<li><a name="'perl_patchlevel'"></a><b><code class="inline"><span class="w">perl_patchlevel</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>This is the Perl patch level, a numeric change identifier,
as defined by whichever source code maintenance system
is used to maintain the patches; currently Perforce.
It does not correlate with the Perl version numbers or
the maintenance versus development dichotomy except
by also being increasing.</p>
</li>
<li><a name="'PERL_REVISION'"></a><b><code class="inline"><span class="w">PERL_REVISION</span></code>
</b>
<p>From <i>Oldsyms.U</i>:</p>
<p>In a Perl version number such as 5.6.2, this is the 5.
This value is manually set in <i>patchlevel.h</i></p>
</li>
<li><a name="'PERL_SUBVERSION'"></a><b><code class="inline"><span class="w">PERL_SUBVERSION</span></code>
</b>
<p>From <i>Oldsyms.U</i>:</p>
<p>In a Perl version number such as 5.6.2, this is the 2.
Values greater than 50 represent potentially unstable
development subversions.
This value is manually set in <i>patchlevel.h</i></p>
</li>
<li><a name="'PERL_VERSION'"></a><b><code class="inline"><span class="w">PERL_VERSION</span></code>
</b>
<p>From <i>Oldsyms.U</i>:</p>
<p>In a Perl version number such as 5.6.2, this is the 6.
This value is manually set in <i>patchlevel.h</i></p>
</li>
<li><a name="'perladmin'"></a><b><code class="inline"><span class="w">perladmin</span></code>
</b>
<p>From <i>perladmin.U</i>:</p>
<p>Electronic mail address of the perl5 administrator.</p>
</li>
<li><a name="'perllibs'"></a><b><code class="inline"><span class="w">perllibs</span></code>
</b>
<p>From <i>End.U</i>:</p>
<p>The list of libraries needed by Perl only (any libraries needed
by extensions only will by dropped, if using dynamic loading).</p>
</li>
<li><a name="'perlpath'"></a><b><code class="inline"><span class="w">perlpath</span></code>
</b>
<p>From <i>perlpath.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">PERLPATH</span></code>
symbol,
which contains the name of the perl interpreter to be used in
shell scripts and in the "eval <code class="inline"><a class="l_k" href="functions/exec.html">exec</a></code>" idiom. This variable is
not necessarily the pathname of the file containing the perl
interpreter; you must append the executable extension (_exe) if
it is not already present. Note that Perl code that runs during
the Perl build process cannot reference this variable, as Perl
may not have been installed, or even if installed, may be a
different version of Perl.</p>
</li>
<li><a name="'pg'"></a><b><code class="inline"><span class="w">pg</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the pg program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">pg</span></code>
and is not useful.</p>
</li>
<li><a name="'phostname'"></a><b><code class="inline"><span class="w">phostname</span></code>
</b>
<p>From <i>myhostname.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">PHOSTNAME</span></code>
symbol,
which is a command that can be fed to popen() to get the host name.
The program should probably not presume that the domain is or isn't
there already.</p>
</li>
<li><a name="'pidtype'"></a><b><code class="inline"><span class="w">pidtype</span></code>
</b>
<p>From <i>pidtype.U</i>:</p>
<p>This variable defines <code class="inline"><span class="w">PIDTYPE</span></code>
to be something like pid_t, int,
ushort, or whatever type is used to declare process ids in the kernel.</p>
</li>
<li><a name="'plibpth'"></a><b><code class="inline"><span class="w">plibpth</span></code>
</b>
<p>From <i>libpth.U</i>:</p>
<p>Holds the private path used by Configure to find out the libraries.
Its value is prepend to libpth. This variable takes care of special
machines, like the mips. Usually, it should be empty.</p>
</li>
<li><a name="'pmake'"></a><b><code class="inline"><span class="w">pmake</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'pr'"></a><b><code class="inline"><span class="w">pr</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'prefix'"></a><b><code class="inline"><span class="w">prefix</span></code>
</b>
<p>From <i>prefix.U</i>:</p>
<p>This variable holds the name of the directory below which the
user will install the package. Usually, this is <i>/usr/local</i>, and
executables go in <i>/usr/local/bin</i>, library stuff in <i>/usr/local/lib</i>,
man pages in <i>/usr/local/man</i>, etc. It is only used to set defaults
for things in <i>bin.U</i>, <i>mansrc.U</i>, <i>privlib.U</i>, or <i>scriptdir.U</i>.</p>
</li>
<li><a name="'prefixexp'"></a><b><code class="inline"><span class="w">prefixexp</span></code>
</b>
<p>From <i>prefix.U</i>:</p>
<p>This variable holds the full absolute path of the directory below
which the user will install the package. Derived from prefix.</p>
</li>
<li><a name="'privlib'"></a><b><code class="inline"><span class="w">privlib</span></code>
</b>
<p>From <i>privlib.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">PRIVLIB</span></code>
symbol,
which is the name of the private library for this package. It may
have a <i>~</i> on the front. It is up to the makefile to eventually create
this directory while performing installation (with <i>~</i> substitution).</p>
</li>
<li><a name="'privlibexp'"></a><b><code class="inline"><span class="w">privlibexp</span></code>
</b>
<p>From <i>privlib.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of privlib, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'procselfexe'"></a><b><code class="inline"><span class="w">procselfexe</span></code>
</b>
<p>From <i>d_procselfexe.U</i>:</p>
<p>If d_procselfexe is defined, $procselfexe is the filename
of the symbolic link pointing to the absolute pathname of
the executing program.</p>
</li>
<li><a name="'prototype'"></a><b><code class="inline"><a class="l_k" href="functions/prototype.html">prototype</a></code></b>
<p>From <i>prototype.U</i>:</p>
<p>This variable holds the eventual value of <code class="inline"><span class="w">CAN_PROTOTYPE</span></code>
, which
indicates the C compiler can handle funciton prototypes.</p>
</li>
<li><a name="'ptrsize'"></a><b><code class="inline"><span class="w">ptrsize</span></code>
</b>
<p>From <i>ptrsize.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">PTRSIZE</span></code>
symbol, which
indicates to the C program how many bytes there are in a pointer.</p>
</li>
</ul>
<a name="q"></a><h2>q</h2>
<ul>
<li><a name="'quadkind'"></a><b><code class="inline"><span class="w">quadkind</span></code>
</b>
<p>From <i>quadtype.U</i>:</p>
<p>This variable, if defined, encodes the type of a quad:
1 = int, 2 = long, 3 = long long, 4 = int64_t.</p>
</li>
<li><a name="'quadtype'"></a><b><code class="inline"><span class="w">quadtype</span></code>
</b>
<p>From <i>quadtype.U</i>:</p>
<p>This variable defines Quad_t to be something like long, int,
long long, int64_t, or whatever type is used for 64-bit integers.</p>
</li>
</ul>
<a name="r"></a><h2>r</h2>
<ul>
<li><a name="'randbits'"></a><b><code class="inline"><span class="w">randbits</span></code>
</b>
<p>From <i>randfunc.U</i>:</p>
<p>Indicates how many bits are produced by the function used to
generate normalized random numbers.</p>
</li>
<li><a name="'randfunc'"></a><b><code class="inline"><span class="w">randfunc</span></code>
</b>
<p>From <i>randfunc.U</i>:</p>
<p>Indicates the name of the random number function to use.
Values include drand48, random, and rand. In C programs,
the <code class="inline"><span class="w">Drand01</span></code>
macro is defined to generate uniformly distributed
random numbers over the range [0., 1.[ (see drand01 and nrand).</p>
</li>
<li><a name="'random_r_proto'"></a><b><code class="inline"><span class="w">random_r_proto</span></code>
</b>
<p>From <i>d_random_r.U</i>:</p>
<p>This variable encodes the prototype of random_r.
It is zero if d_random_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_random_r
is defined.</p>
</li>
<li><a name="'randseedtype'"></a><b><code class="inline"><span class="w">randseedtype</span></code>
</b>
<p>From <i>randfunc.U</i>:</p>
<p>Indicates the type of the argument of the seedfunc.</p>
</li>
<li><a name="'ranlib'"></a><b><code class="inline"><span class="w">ranlib</span></code>
</b>
<p>From <i>orderlib.U</i>:</p>
<p>This variable is set to the pathname of the ranlib program, if it is
needed to generate random libraries. Set to <code class="inline"><span class="j">:</span></code>
if ar can generate
random libraries or if random libraries are not supported</p>
</li>
<li><a name="'rd_nodata'"></a><b><code class="inline"><span class="w">rd_nodata</span></code>
</b>
<p>From <i>nblock_io.U</i>:</p>
<p>This variable holds the return code from read() when no data is
present. It should be -1, but some systems return 0 when <code class="inline"><span class="w">O_NDELAY</span></code>
is
used, which is a shame because you cannot make the difference between
no data and an <i>EOF.</i>. Sigh!</p>
</li>
<li><a name="'readdir64_r_proto'"></a><b><code class="inline"><span class="w">readdir64_r_proto</span></code>
</b>
<p>From <i>d_readdir64_r.U</i>:</p>
<p>This variable encodes the prototype of readdir64_r.
It is zero if d_readdir64_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_readdir64_r
is defined.</p>
</li>
<li><a name="'readdir_r_proto'"></a><b><code class="inline"><span class="w">readdir_r_proto</span></code>
</b>
<p>From <i>d_readdir_r.U</i>:</p>
<p>This variable encodes the prototype of readdir_r.
It is zero if d_readdir_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_readdir_r
is defined.</p>
</li>
<li><a name="'revision'"></a><b><code class="inline"><span class="w">revision</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The value of revision comes from the <i>patchlevel.h</i> file.
In a version number such as 5.6.1, this is the <code class="inline"><span class="n">5</span></code>
.
In <i>patchlevel.h</i>, this is referred to as <code class="inline"><span class="w">PERL_REVISION</span></code>
.</p>
</li>
<li><a name="'rm'"></a><b><code class="inline"><span class="w">rm</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the rm program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">rm</span></code>
and is not useful.</p>
</li>
<li><a name="'rm_try'"></a><b><code class="inline"><span class="w">rm_try</span></code>
</b>
<p>From <i>Unix.U</i>:</p>
<p>This is a cleanup variable for try test programs.
Internal Configure use only.</p>
</li>
<li><a name="'rmail'"></a><b><code class="inline"><span class="w">rmail</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'run'"></a><b><code class="inline"><span class="w">run</span></code>
</b>
<p>From <i>Cross.U</i>:</p>
<p>This variable contains the command used by Configure
to copy and execute a cross-compiled executable in the
target host. Useful and available only during Perl build.
Empty string '' if not cross-compiling.</p>
</li>
<li><a name="'runnm'"></a><b><code class="inline"><span class="w">runnm</span></code>
</b>
<p>From <i>usenm.U</i>:</p>
<p>This variable contains <code class="inline"><span class="w">true</span></code>
or <code class="inline"><span class="w">false</span></code>
depending whether the
nm extraction should be performed or not, according to the value
of usenm and the flags on the Configure command line.</p>
</li>
</ul>
<a name="s"></a><h2>s</h2>
<ul>
<li><a name="'sched_yield'"></a><b><code class="inline"><span class="w">sched_yield</span></code>
</b>
<p>From <i>d_pthread_y.U</i>:</p>
<p>This variable defines the way to yield the execution
of the current thread.</p>
</li>
<li><a name="'scriptdir'"></a><b><code class="inline"><span class="w">scriptdir</span></code>
</b>
<p>From <i>scriptdir.U</i>:</p>
<p>This variable holds the name of the directory in which the user wants
to put publicly scripts for the package in question. It is either
the same directory as for binaries, or a special one that can be
mounted across different architectures, like <i>/usr/share</i>. Programs
must be prepared to deal with <i>~name</i> expansion.</p>
</li>
<li><a name="'scriptdirexp'"></a><b><code class="inline"><span class="w">scriptdirexp</span></code>
</b>
<p>From <i>scriptdir.U</i>:</p>
<p>This variable is the same as scriptdir, but is filename expanded
at configuration time, for programs not wanting to bother with it.</p>
</li>
<li><a name="'sed'"></a><b><code class="inline"><span class="w">sed</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the sed program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">sed</span></code>
and is not useful.</p>
</li>
<li><a name="'seedfunc'"></a><b><code class="inline"><span class="w">seedfunc</span></code>
</b>
<p>From <i>randfunc.U</i>:</p>
<p>Indicates the random number generating seed function.
Values include srand48, srandom, and srand.</p>
</li>
<li><a name="'selectminbits'"></a><b><code class="inline"><span class="w">selectminbits</span></code>
</b>
<p>From <i>selectminbits.U</i>:</p>
<p>This variable holds the minimum number of bits operated by select.
That is, if you do select(n, ...), how many bits at least will be
cleared in the masks if some activity is detected. Usually this
is either n or 32*ceil(<i>n/32</i>), especially many little-endians do
the latter. This is only useful if you have select(), naturally.</p>
</li>
<li><a name="'selecttype'"></a><b><code class="inline"><span class="w">selecttype</span></code>
</b>
<p>From <i>selecttype.U</i>:</p>
<p>This variable holds the type used for the 2nd, 3rd, and 4th
arguments to select. Usually, this is <code class="inline"><span class="w">fd_set</span> *</code>
, if <code class="inline"><span class="w">HAS_FD_SET</span></code>
is defined, and <code class="inline"><a class="l_k" href="functions/int.html">int</a> <span class="i">*</span></code>
otherwise. This is only useful if you
have select(), naturally.</p>
</li>
<li><a name="'sendmail'"></a><b><code class="inline"><span class="w">sendmail</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'setgrent_r_proto'"></a><b><code class="inline"><span class="w">setgrent_r_proto</span></code>
</b>
<p>From <i>d_setgrent_r.U</i>:</p>
<p>This variable encodes the prototype of setgrent_r.
It is zero if d_setgrent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_setgrent_r
is defined.</p>
</li>
<li><a name="'sethostent_r_proto'"></a><b><code class="inline"><span class="w">sethostent_r_proto</span></code>
</b>
<p>From <i>d_sethostent_r.U</i>:</p>
<p>This variable encodes the prototype of sethostent_r.
It is zero if d_sethostent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_sethostent_r
is defined.</p>
</li>
<li><a name="'setlocale_r_proto'"></a><b><code class="inline"><span class="w">setlocale_r_proto</span></code>
</b>
<p>From <i>d_setlocale_r.U</i>:</p>
<p>This variable encodes the prototype of setlocale_r.
It is zero if d_setlocale_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_setlocale_r
is defined.</p>
</li>
<li><a name="'setnetent_r_proto'"></a><b><code class="inline"><span class="w">setnetent_r_proto</span></code>
</b>
<p>From <i>d_setnetent_r.U</i>:</p>
<p>This variable encodes the prototype of setnetent_r.
It is zero if d_setnetent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_setnetent_r
is defined.</p>
</li>
<li><a name="'setprotoent_r_proto'"></a><b><code class="inline"><span class="w">setprotoent_r_proto</span></code>
</b>
<p>From <i>d_setprotoent_r.U</i>:</p>
<p>This variable encodes the prototype of setprotoent_r.
It is zero if d_setprotoent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_setprotoent_r
is defined.</p>
</li>
<li><a name="'setpwent_r_proto'"></a><b><code class="inline"><span class="w">setpwent_r_proto</span></code>
</b>
<p>From <i>d_setpwent_r.U</i>:</p>
<p>This variable encodes the prototype of setpwent_r.
It is zero if d_setpwent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_setpwent_r
is defined.</p>
</li>
<li><a name="'setservent_r_proto'"></a><b><code class="inline"><span class="w">setservent_r_proto</span></code>
</b>
<p>From <i>d_setservent_r.U</i>:</p>
<p>This variable encodes the prototype of setservent_r.
It is zero if d_setservent_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_setservent_r
is defined.</p>
</li>
<li><a name="'sh'"></a><b><code class="inline"><span class="w">sh</span></code>
</b>
<p>From <i>sh.U</i>:</p>
<p>This variable contains the full pathname of the shell used
on this system to execute Bourne shell scripts. Usually, this will be
<i>/bin/sh</i>, though it's possible that some systems will have <i>/bin/ksh</i>,
<i>/bin/pdksh</i>, <i>/bin/ash</i>, <i>/bin/bash</i>, or even something such as
D:<i>/bin/sh.exe</i>.
This unit comes before <i>Options.U</i>, so you can't set sh with a <code class="inline">-<span class="w">D</span></code>
option, though you can override this (and startsh)
with <code class="inline">-O -<span class="w">Dsh</span>=<span class="q"><i></span>/<span class="w">bin</span>/<span class="w">whatever</span><span class="q"></i></span> -<span class="w">Dstartsh</span>=<span class="w">whatever</span></code>
</p>
</li>
<li><a name="'shar'"></a><b><code class="inline"><span class="w">shar</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'sharpbang'"></a><b><code class="inline"><span class="w">sharpbang</span></code>
</b>
<p>From <i>spitshell.U</i>:</p>
<p>This variable contains the string #! if this system supports that
construct.</p>
</li>
<li><a name="'shmattype'"></a><b><code class="inline"><span class="w">shmattype</span></code>
</b>
<p>From <i>d_shmat.U</i>:</p>
<p>This symbol contains the type of pointer returned by shmat().
It can be <code class="inline"><span class="w">void</span> *</code>
or <code class="inline"><span class="w">char</span> *</code>
.</p>
</li>
<li><a name="'shortsize'"></a><b><code class="inline"><span class="w">shortsize</span></code>
</b>
<p>From <i>intsize.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">SHORTSIZE</span></code>
symbol which
indicates to the C program how many bytes there are in a short.</p>
</li>
<li><a name="'shrpenv'"></a><b><code class="inline"><span class="w">shrpenv</span></code>
</b>
<p>From <i>libperl.U</i>:</p>
<p>If the user builds a shared <i>libperl.so</i>, then we need to tell the
<code class="inline"><span class="w">perl</span></code>
executable where it will be able to find the installed <i>libperl.so</i>.
One way to do this on some systems is to set the environment variable
<code class="inline"><span class="w">LD_RUN_PATH</span></code>
to the directory that will be the final location of the
shared <i>libperl.so</i>. The makefile can use this with something like
$shrpenv $(<code class="inline"><span class="w">CC</span></code>
) -o perl <i>perlmain.o</i> $libperl $libs
Typical values are
shrpenv="env <code class="inline"><span class="w">LD_RUN_PATH</span></code>
=<i>$archlibexp/<code class="inline"><span class="w">CORE</span></code>
</i>"
or
shrpenv=''
See the main perl <i>Makefile.SH</i> for actual working usage.
Alternatively, we might be able to use a command line option such
as -R <i>$archlibexp/<code class="inline"><span class="w">CORE</span></code>
</i> (Solaris) or -Wl,-rpath
<i>$archlibexp/<code class="inline"><span class="w">CORE</span></code>
</i> (Linux).</p>
</li>
<li><a name="'shsharp'"></a><b><code class="inline"><span class="w">shsharp</span></code>
</b>
<p>From <i>spitshell.U</i>:</p>
<p>This variable tells further Configure units whether your sh can
handle # comments.</p>
</li>
<li><a name="'sig_count'"></a><b><code class="inline"><span class="w">sig_count</span></code>
</b>
<p>From <i>sig_name.U</i>:</p>
<p>This variable holds a number larger than the largest valid
signal number. This is usually the same as the <code class="inline"><span class="w">NSIG</span></code>
macro.</p>
</li>
<li><a name="'sig_name'"></a><b><code class="inline"><span class="w">sig_name</span></code>
</b>
<p>From <i>sig_name.U</i>:</p>
<p>This variable holds the signal names, space separated. The leading
<code class="inline"><span class="w">SIG</span></code>
in signal name is removed. A <code class="inline"><span class="w">ZERO</span></code>
is prepended to the list.
This is currently not used, sig_name_init is used instead.</p>
</li>
<li><a name="'sig_name_init'"></a><b><code class="inline"><span class="w">sig_name_init</span></code>
</b>
<p>From <i>sig_name.U</i>:</p>
<p>This variable holds the signal names, enclosed in double quotes and
separated by commas, suitable for use in the <code class="inline"><span class="w">SIG_NAME</span></code>
definition
below. A <code class="inline"><span class="w">ZERO</span></code>
is prepended to the list, and the list is
terminated with a plain 0. The leading <code class="inline"><span class="w">SIG</span></code>
in signal names
is removed. See sig_num.</p>
</li>
<li><a name="'sig_num'"></a><b><code class="inline"><span class="w">sig_num</span></code>
</b>
<p>From <i>sig_name.U</i>:</p>
<p>This variable holds the signal numbers, space separated. A <code class="inline"><span class="w">ZERO</span></code>
is
prepended to the list (corresponding to the fake <code class="inline"><span class="w">SIGZERO</span></code>
).
Those numbers correspond to the value of the signal listed
in the same place within the sig_name list.
This is currently not used, sig_num_init is used instead.</p>
</li>
<li><a name="'sig_num_init'"></a><b><code class="inline"><span class="w">sig_num_init</span></code>
</b>
<p>From <i>sig_name.U</i>:</p>
<p>This variable holds the signal numbers, enclosed in double quotes and
separated by commas, suitable for use in the <code class="inline"><span class="w">SIG_NUM</span></code>
definition
below. A <code class="inline"><span class="w">ZERO</span></code>
is prepended to the list, and the list is
terminated with a plain 0.</p>
</li>
<li><a name="'sig_size'"></a><b><code class="inline"><span class="w">sig_size</span></code>
</b>
<p>From <i>sig_name.U</i>:</p>
<p>This variable contains the number of elements of the sig_name
and sig_num arrays.</p>
</li>
<li><a name="'signal_t'"></a><b><code class="inline"><span class="w">signal_t</span></code>
</b>
<p>From <i>d_voidsig.U</i>:</p>
<p>This variable holds the type of the signal handler (void or int).</p>
</li>
<li><a name="'sitearch'"></a><b><code class="inline"><span class="w">sitearch</span></code>
</b>
<p>From <i>sitearch.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">SITEARCH</span></code>
symbol,
which is the name of the private library for this package. It may
have a <i>~</i> on the front. It is up to the makefile to eventually create
this directory while performing installation (with <i>~</i> substitution).
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
architecture-dependent modules in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'sitearchexp'"></a><b><code class="inline"><span class="w">sitearchexp</span></code>
</b>
<p>From <i>sitearch.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of sitearch, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'sitebin'"></a><b><code class="inline"><span class="w">sitebin</span></code>
</b>
<p>From <i>sitebin.U</i>:</p>
<p>This variable holds the name of the directory in which the user wants
to put add-on publicly executable files for the package in question. It
is most often a local directory such as <i>/usr/local/bin</i>. Programs using
this variable must be prepared to deal with <i>~name</i> substitution.
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
executables in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'sitebinexp'"></a><b><code class="inline"><span class="w">sitebinexp</span></code>
</b>
<p>From <i>sitebin.U</i>:</p>
<p>This is the same as the sitebin variable, but is filename expanded at
configuration time, for use in your makefiles.</p>
</li>
<li><a name="'sitehtml1dir'"></a><b><code class="inline"><span class="w">sitehtml1dir</span></code>
</b>
<p>From <i>sitehtml1dir.U</i>:</p>
<p>This variable contains the name of the directory in which site-specific
html source pages are to be put. It is the responsibility of the
<i>Makefile.SH</i> to get the value of this into the proper command.
You must be prepared to do the <i>~name</i> expansion yourself.
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
html pages in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'sitehtml1direxp'"></a><b><code class="inline"><span class="w">sitehtml1direxp</span></code>
</b>
<p>From <i>sitehtml1dir.U</i>:</p>
<p>This variable is the same as the sitehtml1dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'sitehtml3dir'"></a><b><code class="inline"><span class="w">sitehtml3dir</span></code>
</b>
<p>From <i>sitehtml3dir.U</i>:</p>
<p>This variable contains the name of the directory in which site-specific
library html source pages are to be put. It is the responsibility of the
<i>Makefile.SH</i> to get the value of this into the proper command.
You must be prepared to do the <i>~name</i> expansion yourself.
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
library html pages in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'sitehtml3direxp'"></a><b><code class="inline"><span class="w">sitehtml3direxp</span></code>
</b>
<p>From <i>sitehtml3dir.U</i>:</p>
<p>This variable is the same as the sitehtml3dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'sitelib'"></a><b><code class="inline"><span class="w">sitelib</span></code>
</b>
<p>From <i>sitelib.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">SITELIB</span></code>
symbol,
which is the name of the private library for this package. It may
have a <i>~</i> on the front. It is up to the makefile to eventually create
this directory while performing installation (with <i>~</i> substitution).
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
architecture-independent modules in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'sitelib_stem'"></a><b><code class="inline"><span class="w">sitelib_stem</span></code>
</b>
<p>From <i>sitelib.U</i>:</p>
<p>This variable is $sitelibexp with any trailing version-specific component
removed. The elements in inc_version_list (<i>inc_version_list.U</i>) can
be tacked onto this variable to generate a list of directories to search.</p>
</li>
<li><a name="'sitelibexp'"></a><b><code class="inline"><span class="w">sitelibexp</span></code>
</b>
<p>From <i>sitelib.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of sitelib, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'siteman1dir'"></a><b><code class="inline"><span class="w">siteman1dir</span></code>
</b>
<p>From <i>siteman1dir.U</i>:</p>
<p>This variable contains the name of the directory in which site-specific
manual source pages are to be put. It is the responsibility of the
<i>Makefile.SH</i> to get the value of this into the proper command.
You must be prepared to do the <i>~name</i> expansion yourself.
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
man1 pages in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'siteman1direxp'"></a><b><code class="inline"><span class="w">siteman1direxp</span></code>
</b>
<p>From <i>siteman1dir.U</i>:</p>
<p>This variable is the same as the siteman1dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'siteman3dir'"></a><b><code class="inline"><span class="w">siteman3dir</span></code>
</b>
<p>From <i>siteman3dir.U</i>:</p>
<p>This variable contains the name of the directory in which site-specific
library man source pages are to be put. It is the responsibility of the
<i>Makefile.SH</i> to get the value of this into the proper command.
You must be prepared to do the <i>~name</i> expansion yourself.
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
man3 pages in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'siteman3direxp'"></a><b><code class="inline"><span class="w">siteman3direxp</span></code>
</b>
<p>From <i>siteman3dir.U</i>:</p>
<p>This variable is the same as the siteman3dir variable, but is filename
expanded at configuration time, for convenient use in makefiles.</p>
</li>
<li><a name="'siteprefix'"></a><b><code class="inline"><span class="w">siteprefix</span></code>
</b>
<p>From <i>siteprefix.U</i>:</p>
<p>This variable holds the full absolute path of the directory below
which the user will install add-on packages.
See <code class="inline"><span class="w">INSTALL</span></code>
for usage and examples.</p>
</li>
<li><a name="'siteprefixexp'"></a><b><code class="inline"><span class="w">siteprefixexp</span></code>
</b>
<p>From <i>siteprefix.U</i>:</p>
<p>This variable holds the full absolute path of the directory below
which the user will install add-on packages. Derived from siteprefix.</p>
</li>
<li><a name="'sitescript'"></a><b><code class="inline"><span class="w">sitescript</span></code>
</b>
<p>From <i>sitescript.U</i>:</p>
<p>This variable holds the name of the directory in which the user wants
to put add-on publicly executable files for the package in question. It
is most often a local directory such as <i>/usr/local/bin</i>. Programs using
this variable must be prepared to deal with <i>~name</i> substitution.
The standard distribution will put nothing in this directory.
After perl has been installed, users may install their own local
scripts in this directory with
MakeMaker <i>Makefile.PL</i>
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'sitescriptexp'"></a><b><code class="inline"><span class="w">sitescriptexp</span></code>
</b>
<p>From <i>sitescript.U</i>:</p>
<p>This is the same as the sitescript variable, but is filename expanded at
configuration time, for use in your makefiles.</p>
</li>
<li><a name="'sizesize'"></a><b><code class="inline"><span class="w">sizesize</span></code>
</b>
<p>From <i>sizesize.U</i>:</p>
<p>This variable contains the size of a sizetype in bytes.</p>
</li>
<li><a name="'sizetype'"></a><b><code class="inline"><span class="w">sizetype</span></code>
</b>
<p>From <i>sizetype.U</i>:</p>
<p>This variable defines sizetype to be something like size_t,
unsigned long, or whatever type is used to declare length
parameters for string functions.</p>
</li>
<li><a name="'sleep'"></a><b><code class="inline"><a class="l_k" href="functions/sleep.html">sleep</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'smail'"></a><b><code class="inline"><span class="w">smail</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'so'"></a><b><code class="inline"><span class="w">so</span></code>
</b>
<p>From <i>so.U</i>:</p>
<p>This variable holds the extension used to identify shared libraries
(also known as shared objects) on the system. Usually set to <code class="inline"><span class="w">so</span></code>
.</p>
</li>
<li><a name="'sockethdr'"></a><b><code class="inline"><span class="w">sockethdr</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable has any cpp <code class="inline">-<span class="w">I</span></code>
flags needed for socket support.</p>
</li>
<li><a name="'socketlib'"></a><b><code class="inline"><span class="w">socketlib</span></code>
</b>
<p>From <i>d_socket.U</i>:</p>
<p>This variable has the names of any libraries needed for socket support.</p>
</li>
<li><a name="'socksizetype'"></a><b><code class="inline"><span class="w">socksizetype</span></code>
</b>
<p>From <i>socksizetype.U</i>:</p>
<p>This variable holds the type used for the size argument
for various socket calls like accept. Usual values include
socklen_t, size_t, and int.</p>
</li>
<li><a name="'sort'"></a><b><code class="inline"><a class="l_k" href="functions/sort.html">sort</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the sort program. After Configure runs,
the value is reset to a plain <code class="inline"><a class="l_k" href="functions/sort.html">sort</a></code> and is not useful.</p>
</li>
<li><a name="'spackage'"></a><b><code class="inline"><span class="w">spackage</span></code>
</b>
<p>From <i>package.U</i>:</p>
<p>This variable contains the name of the package being constructed,
with the first letter uppercased, <i>i.e</i>. suitable for starting
sentences.</p>
</li>
<li><a name="'spitshell'"></a><b><code class="inline"><span class="w">spitshell</span></code>
</b>
<p>From <i>spitshell.U</i>:</p>
<p>This variable contains the command necessary to spit out a runnable
shell on this system. It is either cat or a grep <code class="inline">-<span class="w">v</span></code>
for # comments.</p>
</li>
<li><a name="'sPRId64'"></a><b><code class="inline"><span class="w">sPRId64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format 64-bit decimal numbers (format <code class="inline"><span class="w">d</span></code>
) for output.</p>
</li>
<li><a name="'sPRIeldbl'"></a><b><code class="inline"><span class="w">sPRIeldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">e</span></code>
) for output.</p>
</li>
<li><a name="'sPRIEUldbl'"></a><b><code class="inline"><span class="w">sPRIEUldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">E</span></code>
) for output.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from sPRIeldbl so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'sPRIfldbl'"></a><b><code class="inline"><span class="w">sPRIfldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">f</span></code>
) for output.</p>
</li>
<li><a name="'sPRIFUldbl'"></a><b><code class="inline"><span class="w">sPRIFUldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">F</span></code>
) for output.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from sPRIfldbl so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'sPRIgldbl'"></a><b><code class="inline"><span class="w">sPRIgldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">g</span></code>
) for output.</p>
</li>
<li><a name="'sPRIGUldbl'"></a><b><code class="inline"><span class="w">sPRIGUldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">G</span></code>
) for output.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from sPRIgldbl so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'sPRIi64'"></a><b><code class="inline"><span class="w">sPRIi64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format 64-bit decimal numbers (format <code class="inline"><span class="w">i</span></code>
) for output.</p>
</li>
<li><a name="'sPRIo64'"></a><b><code class="inline"><span class="w">sPRIo64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format 64-bit octal numbers (format <code class="inline"><span class="w">o</span></code>
) for output.</p>
</li>
<li><a name="'sPRIu64'"></a><b><code class="inline"><span class="w">sPRIu64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format 64-bit unsigned decimal numbers (format <code class="inline"><span class="w">u</span></code>
) for output.</p>
</li>
<li><a name="'sPRIx64'"></a><b><code class="inline"><span class="w">sPRIx64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format 64-bit hexadecimal numbers (format <code class="inline"><span class="w">x</span></code>
) for output.</p>
</li>
<li><a name="'sPRIXU64'"></a><b><code class="inline"><span class="w">sPRIXU64</span></code>
</b>
<p>From <i>quadfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format 64-bit hExADECimAl numbers (format <code class="inline"><span class="w">X</span></code>
) for output.
The <code class="inline"><span class="w">U</span></code>
in the name is to separate this from sPRIx64 so that even
case-blind systems can see the difference.</p>
</li>
<li><a name="'srand48_r_proto'"></a><b><code class="inline"><span class="w">srand48_r_proto</span></code>
</b>
<p>From <i>d_srand48_r.U</i>:</p>
<p>This variable encodes the prototype of srand48_r.
It is zero if d_srand48_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_srand48_r
is defined.</p>
</li>
<li><a name="'srandom_r_proto'"></a><b><code class="inline"><span class="w">srandom_r_proto</span></code>
</b>
<p>From <i>d_srandom_r.U</i>:</p>
<p>This variable encodes the prototype of srandom_r.
It is zero if d_srandom_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_srandom_r
is defined.</p>
</li>
<li><a name="'src'"></a><b><code class="inline"><span class="w">src</span></code>
</b>
<p>From <i>src.U</i>:</p>
<p>This variable holds the path to the package source. It is up to
the Makefile to use this variable and set <code class="inline"><span class="w">VPATH</span></code>
accordingly to
find the sources remotely.</p>
</li>
<li><a name="'sSCNfldbl'"></a><b><code class="inline"><span class="w">sSCNfldbl</span></code>
</b>
<p>From <i>longdblfio.U</i>:</p>
<p>This variable, if defined, contains the string used by stdio to
format long doubles (format <code class="inline"><span class="w">f</span></code>
) for input.</p>
</li>
<li><a name="'ssizetype'"></a><b><code class="inline"><span class="w">ssizetype</span></code>
</b>
<p>From <i>ssizetype.U</i>:</p>
<p>This variable defines ssizetype to be something like ssize_t,
long or int. It is used by functions that return a count
of bytes or an error condition. It must be a signed type.
We will pick a type such that sizeof(SSize_t) == sizeof(Size_t).</p>
</li>
<li><a name="'startperl'"></a><b><code class="inline"><span class="w">startperl</span></code>
</b>
<p>From <i>startperl.U</i>:</p>
<p>This variable contains the string to put on the front of a perl
script to make sure (hopefully) that it runs with perl and not some
shell. Of course, that leading line must be followed by the classical
perl idiom:
eval 'exec perl -S $0 ${1+<code class="inline"><span class="i">$@</span></code>
}'
if $running_under_some_shell;
to guarantee perl startup should the shell execute the script. Note
that this magic incatation is not understood by csh.</p>
</li>
<li><a name="'startsh'"></a><b><code class="inline"><span class="w">startsh</span></code>
</b>
<p>From <i>startsh.U</i>:</p>
<p>This variable contains the string to put on the front of a shell
script to make sure (hopefully) that it runs with sh and not some
other shell.</p>
</li>
<li><a name="'static_ext'"></a><b><code class="inline"><span class="w">static_ext</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds a list of <code class="inline"><span class="w">XS</span></code>
extension files we want to
link statically into the package. It is used by Makefile.</p>
</li>
<li><a name="'stdchar'"></a><b><code class="inline"><span class="w">stdchar</span></code>
</b>
<p>From <i>stdchar.U</i>:</p>
<p>This variable conditionally defines <code class="inline"><span class="w">STDCHAR</span></code>
to be the type of char
used in <i>stdio.h</i>. It has the values "unsigned char" or <code class="inline"><span class="w">char</span></code>
.</p>
</li>
<li><a name="'stdio_base'"></a><b><code class="inline"><span class="w">stdio_base</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable defines how, given a <code class="inline"><span class="w">FILE</span></code>
pointer, fp, to access the
_base field (or equivalent) of <i>stdio.h</i>'s <code class="inline"><span class="w">FILE</span></code>
structure. This will
be used to define the macro FILE_base(fp).</p>
</li>
<li><a name="'stdio_bufsiz'"></a><b><code class="inline"><span class="w">stdio_bufsiz</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable defines how, given a <code class="inline"><span class="w">FILE</span></code>
pointer, fp, to determine
the number of bytes store in the I/O buffer pointer to by the
_base field (or equivalent) of <i>stdio.h</i>'s <code class="inline"><span class="w">FILE</span></code>
structure. This will
be used to define the macro FILE_bufsiz(fp).</p>
</li>
<li><a name="'stdio_cnt'"></a><b><code class="inline"><span class="w">stdio_cnt</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable defines how, given a <code class="inline"><span class="w">FILE</span></code>
pointer, fp, to access the
_cnt field (or equivalent) of <i>stdio.h</i>'s <code class="inline"><span class="w">FILE</span></code>
structure. This will
be used to define the macro FILE_cnt(fp).</p>
</li>
<li><a name="'stdio_filbuf'"></a><b><code class="inline"><span class="w">stdio_filbuf</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable defines how, given a <code class="inline"><span class="w">FILE</span></code>
pointer, fp, to tell
stdio to refill its internal buffers (?). This will
be used to define the macro FILE_filbuf(fp).</p>
</li>
<li><a name="'stdio_ptr'"></a><b><code class="inline"><span class="w">stdio_ptr</span></code>
</b>
<p>From <i>d_stdstdio.U</i>:</p>
<p>This variable defines how, given a <code class="inline"><span class="w">FILE</span></code>
pointer, fp, to access the
_ptr field (or equivalent) of <i>stdio.h</i>'s <code class="inline"><span class="w">FILE</span></code>
structure. This will
be used to define the macro FILE_ptr(fp).</p>
</li>
<li><a name="'stdio_stream_array'"></a><b><code class="inline"><span class="w">stdio_stream_array</span></code>
</b>
<p>From <i>stdio_streams.U</i>:</p>
<p>This variable tells the name of the array holding the stdio streams.
Usual values include _iob, __iob, and __sF.</p>
</li>
<li><a name="'strerror_r_proto'"></a><b><code class="inline"><span class="w">strerror_r_proto</span></code>
</b>
<p>From <i>d_strerror_r.U</i>:</p>
<p>This variable encodes the prototype of strerror_r.
It is zero if d_strerror_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_strerror_r
is defined.</p>
</li>
<li><a name="'strings'"></a><b><code class="inline"><span class="w">strings</span></code>
</b>
<p>From <i>i_string.U</i>:</p>
<p>This variable holds the full path of the string header that will be
used. Typically <i>/usr/include/string.h</i> or <i>/usr/include/strings.h</i>.</p>
</li>
<li><a name="'submit'"></a><b><code class="inline"><span class="w">submit</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'subversion'"></a><b><code class="inline"><span class="w">subversion</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The subversion level of this package.
The value of subversion comes from the <i>patchlevel.h</i> file.
In a version number such as 5.6.1, this is the <code class="inline"><span class="n">1</span></code>
.
In <i>patchlevel.h</i>, this is referred to as <code class="inline"><span class="w">PERL_SUBVERSION</span></code>
.
This is unique to perl.</p>
</li>
<li><a name="'sysman'"></a><b><code class="inline"><span class="w">sysman</span></code>
</b>
<p>From <i>sysman.U</i>:</p>
<p>This variable holds the place where the manual is located on this
system. It is not the place where the user wants to put his manual
pages. Rather it is the place where Configure may look to find manual
for unix commands (section 1 of the manual usually). See mansrc.</p>
</li>
</ul>
<a name="t"></a><h2>t</h2>
<ul>
<li><a name="'tail'"></a><b><code class="inline"><span class="w">tail</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'tar'"></a><b><code class="inline"><span class="w">tar</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'targetarch'"></a><b><code class="inline"><span class="w">targetarch</span></code>
</b>
<p>From <i>Cross.U</i>:</p>
<p>If cross-compiling, this variable contains the target architecture.
If not, this will be empty.</p>
</li>
<li><a name="'tbl'"></a><b><code class="inline"><span class="w">tbl</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'tee'"></a><b><code class="inline"><span class="w">tee</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'test'"></a><b><code class="inline"><span class="w">test</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the test program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">test</span></code>
and is not useful.</p>
</li>
<li><a name="'timeincl'"></a><b><code class="inline"><span class="w">timeincl</span></code>
</b>
<p>From <i>i_time.U</i>:</p>
<p>This variable holds the full path of the included time header(s).</p>
</li>
<li><a name="'timetype'"></a><b><code class="inline"><span class="w">timetype</span></code>
</b>
<p>From <i>d_time.U</i>:</p>
<p>This variable holds the type returned by time(). It can be long,
or time_t on <code class="inline"><span class="w">BSD</span></code>
sites (in which case <sys/types.h> should be
included). Anyway, the type Time_t should be used.</p>
</li>
<li><a name="'tmpnam_r_proto'"></a><b><code class="inline"><span class="w">tmpnam_r_proto</span></code>
</b>
<p>From <i>d_tmpnam_r.U</i>:</p>
<p>This variable encodes the prototype of tmpnam_r.
It is zero if d_tmpnam_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_tmpnam_r
is defined.</p>
</li>
<li><a name="'to'"></a><b><code class="inline"><span class="w">to</span></code>
</b>
<p>From <i>Cross.U</i>:</p>
<p>This variable contains the command used by Configure
to copy to from the target host. Useful and available
only during Perl build.
The string <code class="inline"><span class="j">:</span></code>
if not cross-compiling.</p>
</li>
<li><a name="'touch'"></a><b><code class="inline"><span class="w">touch</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the touch program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">touch</span></code>
and is not useful.</p>
</li>
<li><a name="'tr'"></a><b><code class="inline"><a class="l_k" href="functions/tr.html">tr</a></code></b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the tr program. After Configure runs,
the value is reset to a plain <code class="inline"><a class="l_k" href="functions/tr.html">tr</a></code> and is not useful.</p>
</li>
<li><a name="'trnl'"></a><b><code class="inline"><span class="w">trnl</span></code>
</b>
<p>From <i>trnl.U</i>:</p>
<p>This variable contains the value to be passed to the tr(1)
command to transliterate a newline. Typical values are
<code class="inline">\<span class="n">012</span></code>
and <code class="inline">\<span class="w">n</span></code>
. This is needed for <code class="inline"><span class="w">EBCDIC</span></code>
systems where
newline is not necessarily <code class="inline">\<span class="n">012</span></code>
.</p>
</li>
<li><a name="'troff'"></a><b><code class="inline"><span class="w">troff</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'ttyname_r_proto'"></a><b><code class="inline"><span class="w">ttyname_r_proto</span></code>
</b>
<p>From <i>d_ttyname_r.U</i>:</p>
<p>This variable encodes the prototype of ttyname_r.
It is zero if d_ttyname_r is undef, and one of the
<code class="inline"><span class="w">REENTRANT_PROTO_T_ABC</span></code>
macros of <i>reentr.h</i> if d_ttyname_r
is defined.</p>
</li>
</ul>
<a name="u"></a><h2>u</h2>
<ul>
<li><a name="'u16size'"></a><b><code class="inline"><span class="w">u16size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an U16 in bytes.</p>
</li>
<li><a name="'u16type'"></a><b><code class="inline"><span class="w">u16type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's U16.</p>
</li>
<li><a name="'u32size'"></a><b><code class="inline"><span class="w">u32size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an U32 in bytes.</p>
</li>
<li><a name="'u32type'"></a><b><code class="inline"><span class="w">u32type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's U32.</p>
</li>
<li><a name="'u64size'"></a><b><code class="inline"><span class="w">u64size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an U64 in bytes.</p>
</li>
<li><a name="'u64type'"></a><b><code class="inline"><span class="w">u64type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's U64.</p>
</li>
<li><a name="'u8size'"></a><b><code class="inline"><span class="w">u8size</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of an U8 in bytes.</p>
</li>
<li><a name="'u8type'"></a><b><code class="inline"><span class="w">u8type</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's U8.</p>
</li>
<li><a name="'uidformat'"></a><b><code class="inline"><span class="w">uidformat</span></code>
</b>
<p>From <i>uidf.U</i>:</p>
<p>This variable contains the format string used for printing a Uid_t.</p>
</li>
<li><a name="'uidsign'"></a><b><code class="inline"><span class="w">uidsign</span></code>
</b>
<p>From <i>uidsign.U</i>:</p>
<p>This variable contains the signedness of a uidtype.
1 for unsigned, -1 for signed.</p>
</li>
<li><a name="'uidsize'"></a><b><code class="inline"><span class="w">uidsize</span></code>
</b>
<p>From <i>uidsize.U</i>:</p>
<p>This variable contains the size of a uidtype in bytes.</p>
</li>
<li><a name="'uidtype'"></a><b><code class="inline"><span class="w">uidtype</span></code>
</b>
<p>From <i>uidtype.U</i>:</p>
<p>This variable defines Uid_t to be something like uid_t, int,
ushort, or whatever type is used to declare user ids in the kernel.</p>
</li>
<li><a name="'uname'"></a><b><code class="inline"><span class="w">uname</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the uname program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">uname</span></code>
and is not useful.</p>
</li>
<li><a name="'uniq'"></a><b><code class="inline"><span class="w">uniq</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the uniq program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">uniq</span></code>
and is not useful.</p>
</li>
<li><a name="'uquadtype'"></a><b><code class="inline"><span class="w">uquadtype</span></code>
</b>
<p>From <i>quadtype.U</i>:</p>
<p>This variable defines Uquad_t to be something like unsigned long,
unsigned int, unsigned long long, uint64_t, or whatever type is
used for 64-bit integers.</p>
</li>
<li><a name="'use5005threads'"></a><b><code class="inline"><span class="w">use5005threads</span></code>
</b>
<p>From <i>usethreads.U</i>:</p>
<p>This variable conditionally defines the USE_5005THREADS symbol,
and indicates that Perl should be built to use the 5.005-based
threading implementation. Only valid up to 5.8.x.</p>
</li>
<li><a name="'use64bitall'"></a><b><code class="inline"><span class="w">use64bitall</span></code>
</b>
<p>From <i>use64bits.U</i>:</p>
<p>This variable conditionally defines the USE_64_BIT_ALL symbol,
and indicates that 64-bit integer types should be used
when available. The maximal possible
64-bitness is employed: LP64 or ILP64, meaning that you will
be able to use more than 2 gigabytes of memory. This mode is
even more binary incompatible than USE_64_BIT_INT. You may not
be able to run the resulting executable in a 32-bit <code class="inline"><span class="w">CPU</span></code>
at all or
you may need at least to reboot your <code class="inline"><span class="w">OS</span></code>
to 64-bit mode.</p>
</li>
<li><a name="'use64bitint'"></a><b><code class="inline"><span class="w">use64bitint</span></code>
</b>
<p>From <i>use64bits.U</i>:</p>
<p>This variable conditionally defines the USE_64_BIT_INT symbol,
and indicates that 64-bit integer types should be used
when available. The minimal possible 64-bitness
is employed, just enough to get 64-bit integers into Perl.
This may mean using for example "long longs", while your memory
may still be limited to 2 gigabytes.</p>
</li>
<li><a name="'usecrosscompile'"></a><b><code class="inline"><span class="w">usecrosscompile</span></code>
</b>
<p>From <i>Cross.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_CROSS_COMPILE</span></code>
symbol,
and indicates that Perl has been cross-compiled.</p>
</li>
<li><a name="'usedl'"></a><b><code class="inline"><span class="w">usedl</span></code>
</b>
<p>From <i>dlsrc.U</i>:</p>
<p>This variable indicates if the system supports dynamic
loading of some sort. See also dlsrc and dlobj.</p>
</li>
<li><a name="'usefaststdio'"></a><b><code class="inline"><span class="w">usefaststdio</span></code>
</b>
<p>From <i>usefaststdio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_FAST_STDIO</span></code>
symbol,
and indicates that Perl should be built to use <code class="inline"><span class="w">fast</span> <span class="w">stdio</span></code>
.
Defaults to define in Perls 5.8 and earlier, to undef later.</p>
</li>
<li><a name="'useithreads'"></a><b><code class="inline"><span class="w">useithreads</span></code>
</b>
<p>From <i>usethreads.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_ITHREADS</span></code>
symbol,
and indicates that Perl should be built to use the interpreter-based
threading implementation.</p>
</li>
<li><a name="'uselargefiles'"></a><b><code class="inline"><span class="w">uselargefiles</span></code>
</b>
<p>From <i>uselfs.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_LARGE_FILES</span></code>
symbol,
and indicates that large file interfaces should be used when
available.</p>
</li>
<li><a name="'uselongdouble'"></a><b><code class="inline"><span class="w">uselongdouble</span></code>
</b>
<p>From <i>uselongdbl.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_LONG_DOUBLE</span></code>
symbol,
and indicates that long doubles should be used when available.</p>
</li>
<li><a name="'usemallocwrap'"></a><b><code class="inline"><span class="w">usemallocwrap</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable contains y if we are wrapping malloc to prevent
integer overflow during size calculations.</p>
</li>
<li><a name="'usemorebits'"></a><b><code class="inline"><span class="w">usemorebits</span></code>
</b>
<p>From <i>usemorebits.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_MORE_BITS</span></code>
symbol,
and indicates that explicit 64-bit interfaces and long doubles
should be used when available.</p>
</li>
<li><a name="'usemultiplicity'"></a><b><code class="inline"><span class="w">usemultiplicity</span></code>
</b>
<p>From <i>usemultiplicity.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">MULTIPLICITY</span></code>
symbol,
and indicates that Perl should be built to use multiplicity.</p>
</li>
<li><a name="'usemymalloc'"></a><b><code class="inline"><span class="w">usemymalloc</span></code>
</b>
<p>From <i>mallocsrc.U</i>:</p>
<p>This variable contains y if the malloc that comes with this package
is desired over the system's version of malloc. People often include
special versions of malloc for effiency, but such versions are often
less portable. See also mallocsrc and mallocobj.
If this is <code class="inline"><a class="l_k" href="functions/y.html">y</a></code>, then -lmalloc is removed from $libs.</p>
</li>
<li><a name="'usenm'"></a><b><code class="inline"><span class="w">usenm</span></code>
</b>
<p>From <i>usenm.U</i>:</p>
<p>This variable contains <code class="inline"><span class="w">true</span></code>
or <code class="inline"><span class="w">false</span></code>
depending whether the
nm extraction is wanted or not.</p>
</li>
<li><a name="'useopcode'"></a><b><code class="inline"><span class="w">useopcode</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds either <code class="inline"><span class="w">true</span></code>
or <code class="inline"><span class="w">false</span></code>
to indicate
whether the Opcode extension should be used. The sole
use for this currently is to allow an easy mechanism
for users to skip the Opcode extension from the Configure
command line.</p>
</li>
<li><a name="'useperlio'"></a><b><code class="inline"><span class="w">useperlio</span></code>
</b>
<p>From <i>useperlio.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_PERLIO</span></code>
symbol,
and indicates that the PerlIO abstraction should be
used throughout.</p>
</li>
<li><a name="'useposix'"></a><b><code class="inline"><span class="w">useposix</span></code>
</b>
<p>From <i>Extensions.U</i>:</p>
<p>This variable holds either <code class="inline"><span class="w">true</span></code>
or <code class="inline"><span class="w">false</span></code>
to indicate
whether the <code class="inline"><span class="w">POSIX</span></code>
extension should be used. The sole
use for this currently is to allow an easy mechanism
for hints files to indicate that <code class="inline"><span class="w">POSIX</span></code>
will not compile
on a particular system.</p>
</li>
<li><a name="'usereentrant'"></a><b><code class="inline"><span class="w">usereentrant</span></code>
</b>
<p>From <i>usethreads.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_REENTRANT_API</span></code>
symbol,
which indicates that the thread code may try to use the various
_r versions of library functions. This is only potentially
meaningful if usethreads is set and is very experimental, it is
not even prompted for.</p>
</li>
<li><a name="'userelocatableinc'"></a><b><code class="inline"><span class="w">userelocatableinc</span></code>
</b>
<p>From <i>bin.U</i>:</p>
<p>This variable is set to true to indicate that perl should relocate
@<code class="inline"><span class="w">INC</span></code>
entries at runtime based on the path to the perl binary.
Any @<code class="inline"><span class="w">INC</span></code>
paths starting <i>.../</i> are relocated relative to the directory
containing the perl binary, and a logical cleanup of the path is then
made around the join point (removing <i>dir/../</i> pairs)</p>
</li>
<li><a name="'usesfio'"></a><b><code class="inline"><span class="w">usesfio</span></code>
</b>
<p>From <i>d_sfio.U</i>:</p>
<p>This variable is set to true when the user agrees to use sfio.
It is set to false when sfio is not available or when the user
explicitely requests not to use sfio. It is here primarily so
that command-line settings can override the auto-detection of
d_sfio without running into a "WHOA THERE".</p>
</li>
<li><a name="'useshrplib'"></a><b><code class="inline"><span class="w">useshrplib</span></code>
</b>
<p>From <i>libperl.U</i>:</p>
<p>This variable is set to <code class="inline"><span class="w">true</span></code>
if the user wishes
to build a shared libperl, and <code class="inline"><span class="w">false</span></code>
otherwise.</p>
</li>
<li><a name="'usesitecustomize'"></a><b><code class="inline"><span class="w">usesitecustomize</span></code>
</b>
<p>From <i>d_sitecustomize.U</i>:</p>
<p>This variable is set to true when the user requires a mechanism that
allows the sysadmin to add entries to @<code class="inline"><span class="w">INC</span></code>
at runtime. This variable
being set, makes perl run <i>$<i>sitelib/sitecustomize.pl</i></i> at startup.</p>
</li>
<li><a name="'usesocks'"></a><b><code class="inline"><span class="w">usesocks</span></code>
</b>
<p>From <i>usesocks.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_SOCKS</span></code>
symbol,
and indicates that Perl should be built to use <code class="inline"><span class="w">SOCKS</span></code>
.</p>
</li>
<li><a name="'usethreads'"></a><b><code class="inline"><span class="w">usethreads</span></code>
</b>
<p>From <i>usethreads.U</i>:</p>
<p>This variable conditionally defines the <code class="inline"><span class="w">USE_THREADS</span></code>
symbol,
and indicates that Perl should be built to use threads.</p>
</li>
<li><a name="'usevendorprefix'"></a><b><code class="inline"><span class="w">usevendorprefix</span></code>
</b>
<p>From <i>vendorprefix.U</i>:</p>
<p>This variable tells whether the vendorprefix
and consequently other vendor* paths are in use.</p>
</li>
<li><a name="'usevfork'"></a><b><code class="inline"><span class="w">usevfork</span></code>
</b>
<p>From <i>d_vfork.U</i>:</p>
<p>This variable is set to true when the user accepts to use vfork.
It is set to false when no vfork is available or when the user
explicitely requests not to use vfork.</p>
</li>
<li><a name="'usrinc'"></a><b><code class="inline"><span class="w">usrinc</span></code>
</b>
<p>From <i>usrinc.U</i>:</p>
<p>This variable holds the path of the include files, which is
usually <i>/usr/include</i>. It is mainly used by other Configure units.</p>
</li>
<li><a name="'uuname'"></a><b><code class="inline"><span class="w">uuname</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'uvoformat'"></a><b><code class="inline"><span class="w">uvoformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">UV</span></code>
as an unsigned octal integer.</p>
</li>
<li><a name="'uvsize'"></a><b><code class="inline"><span class="w">uvsize</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable is the size of a <code class="inline"><span class="w">UV</span></code>
in bytes.</p>
</li>
<li><a name="'uvtype'"></a><b><code class="inline"><span class="w">uvtype</span></code>
</b>
<p>From <i>perlxv.U</i>:</p>
<p>This variable contains the C type used for Perl's <code class="inline"><span class="w">UV</span></code>
.</p>
</li>
<li><a name="'uvuformat'"></a><b><code class="inline"><span class="w">uvuformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">UV</span></code>
as an unsigned decimal integer.</p>
</li>
<li><a name="'uvxformat'"></a><b><code class="inline"><span class="w">uvxformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">UV</span></code>
as an unsigned hexadecimal integer in lowercase abcdef.</p>
</li>
<li><a name="'uvXUformat'"></a><b><code class="inline"><span class="w">uvXUformat</span></code>
</b>
<p>From <i>perlxvf.U</i>:</p>
<p>This variable contains the format string used for printing
a Perl <code class="inline"><span class="w">UV</span></code>
as an unsigned hexadecimal integer in uppercase <code class="inline"><span class="w">ABCDEF</span></code>
.</p>
</li>
</ul>
<a name="v"></a><h2>v</h2>
<ul>
<li><a name="'vendorarch'"></a><b><code class="inline"><span class="w">vendorarch</span></code>
</b>
<p>From <i>vendorarch.U</i>:</p>
<p>This variable contains the value of the <code class="inline"><span class="w">PERL_VENDORARCH</span></code>
symbol.
It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place their own
architecture-dependent modules and extensions in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorarchexp'"></a><b><code class="inline"><span class="w">vendorarchexp</span></code>
</b>
<p>From <i>vendorarch.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorarch, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorbin'"></a><b><code class="inline"><span class="w">vendorbin</span></code>
</b>
<p>From <i>vendorbin.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">VENDORBIN</span></code>
symbol.
It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place additional
binaries in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorbinexp'"></a><b><code class="inline"><span class="w">vendorbinexp</span></code>
</b>
<p>From <i>vendorbin.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorbin, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorhtml1dir'"></a><b><code class="inline"><span class="w">vendorhtml1dir</span></code>
</b>
<p>From <i>vendorhtml1dir.U</i>:</p>
<p>This variable contains the name of the directory for html
pages. It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place their own
html pages in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorhtml1direxp'"></a><b><code class="inline"><span class="w">vendorhtml1direxp</span></code>
</b>
<p>From <i>vendorhtml1dir.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorhtml1dir, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorhtml3dir'"></a><b><code class="inline"><span class="w">vendorhtml3dir</span></code>
</b>
<p>From <i>vendorhtml3dir.U</i>:</p>
<p>This variable contains the name of the directory for html
library pages. It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place their own
html pages for modules and extensions in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorhtml3direxp'"></a><b><code class="inline"><span class="w">vendorhtml3direxp</span></code>
</b>
<p>From <i>vendorhtml3dir.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorhtml3dir, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorlib'"></a><b><code class="inline"><span class="w">vendorlib</span></code>
</b>
<p>From <i>vendorlib.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">VENDORLIB</span></code>
symbol,
which is the name of the private library for this package.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place their own
modules in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorlib_stem'"></a><b><code class="inline"><span class="w">vendorlib_stem</span></code>
</b>
<p>From <i>vendorlib.U</i>:</p>
<p>This variable is $vendorlibexp with any trailing version-specific component
removed. The elements in inc_version_list (<i>inc_version_list.U</i>) can
be tacked onto this variable to generate a list of directories to search.</p>
</li>
<li><a name="'vendorlibexp'"></a><b><code class="inline"><span class="w">vendorlibexp</span></code>
</b>
<p>From <i>vendorlib.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorlib, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorman1dir'"></a><b><code class="inline"><span class="w">vendorman1dir</span></code>
</b>
<p>From <i>vendorman1dir.U</i>:</p>
<p>This variable contains the name of the directory for man1
pages. It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place their own
man1 pages in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorman1direxp'"></a><b><code class="inline"><span class="w">vendorman1direxp</span></code>
</b>
<p>From <i>vendorman1dir.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorman1dir, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorman3dir'"></a><b><code class="inline"><span class="w">vendorman3dir</span></code>
</b>
<p>From <i>vendorman3dir.U</i>:</p>
<p>This variable contains the name of the directory for man3
pages. It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place their own
man3 pages in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorman3direxp'"></a><b><code class="inline"><span class="w">vendorman3direxp</span></code>
</b>
<p>From <i>vendorman3dir.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorman3dir, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'vendorprefix'"></a><b><code class="inline"><span class="w">vendorprefix</span></code>
</b>
<p>From <i>vendorprefix.U</i>:</p>
<p>This variable holds the full absolute path of the directory below
which the vendor will install add-on packages.
See <code class="inline"><span class="w">INSTALL</span></code>
for usage and examples.</p>
</li>
<li><a name="'vendorprefixexp'"></a><b><code class="inline"><span class="w">vendorprefixexp</span></code>
</b>
<p>From <i>vendorprefix.U</i>:</p>
<p>This variable holds the full absolute path of the directory below
which the vendor will install add-on packages. Derived from vendorprefix.</p>
</li>
<li><a name="'vendorscript'"></a><b><code class="inline"><span class="w">vendorscript</span></code>
</b>
<p>From <i>vendorscript.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">VENDORSCRIPT</span></code>
symbol.
It may have a <i>~</i> on the front.
The standard distribution will put nothing in this directory.
Vendors who distribute perl may wish to place additional
executable scripts in this directory with
MakeMaker <i>Makefile.PL</i> <code class="inline"><span class="w">INSTALLDIRS</span></code>
=vendor
or equivalent. See <code class="inline"><span class="w">INSTALL</span></code>
for details.</p>
</li>
<li><a name="'vendorscriptexp'"></a><b><code class="inline"><span class="w">vendorscriptexp</span></code>
</b>
<p>From <i>vendorscript.U</i>:</p>
<p>This variable is the <i>~name</i> expanded version of vendorscript, so that you
may use it directly in Makefiles or shell scripts.</p>
</li>
<li><a name="'version'"></a><b><code class="inline"><span class="w">version</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>The full version number of this package, such as 5.6.1 (or 5_6_1).
This combines revision, patchlevel, and subversion to get the
full version number, including any possible subversions.
This is suitable for use as a directory name, and hence is
filesystem dependent.</p>
</li>
<li><a name="'version_patchlevel_string'"></a><b><code class="inline"><span class="w">version_patchlevel_string</span></code>
</b>
<p>From <i>patchlevel.U</i>:</p>
<p>This is a string combining version, subversion and
perl_patchlevel (if perl_patchlevel is non-zero).
It is typically something like
'version 7 subversion 1' or
'version 7 subversion 1 patchlevel 11224'
It is computed here to avoid duplication of code in <i>myconfig.SH</i>
and <i>lib/Config.pm</i>.</p>
</li>
<li><a name="'versiononly'"></a><b><code class="inline"><span class="w">versiononly</span></code>
</b>
<p>From <i>versiononly.U</i>:</p>
<p>If set, this symbol indicates that only the version-specific
components of a perl installation should be installed.
This may be useful for making a test installation of a new
version without disturbing the existing installation.
Setting versiononly is equivalent to setting installperl's -v option.
In particular, the non-versioned scripts and programs such as
a2p, c2ph, h2xs, pod2*, and perldoc are not installed
(see <code class="inline"><span class="w">INSTALL</span></code>
for a more complete list). Nor are the man
pages installed.
Usually, this is undef.</p>
</li>
<li><a name="'vi'"></a><b><code class="inline"><span class="w">vi</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'voidflags'"></a><b><code class="inline"><span class="w">voidflags</span></code>
</b>
<p>From <i>voidflags.U</i>:</p>
<p>This variable contains the eventual value of the <code class="inline"><span class="w">VOIDFLAGS</span></code>
symbol,
which indicates how much support of the void type is given by this
compiler. See <code class="inline"><span class="w">VOIDFLAGS</span></code>
for more info.</p>
</li>
</ul>
<a name="x"></a><h2>x</h2>
<ul>
<li><a name="'xlibpth'"></a><b><code class="inline"><span class="w">xlibpth</span></code>
</b>
<p>From <i>libpth.U</i>:</p>
<p>This variable holds extra path (space-separated) used to find
libraries on this platform, for example <code class="inline"><span class="w">CPU</span></code>
-specific libraries
(on multi-<code class="inline"><span class="w">CPU</span></code>
platforms) may be listed here.</p>
</li>
</ul>
<a name="y"></a><h2>y</h2>
<ul>
<li><a name="'yacc'"></a><b><code class="inline"><span class="w">yacc</span></code>
</b>
<p>From <i>yacc.U</i>:</p>
<p>This variable holds the name of the compiler compiler we
want to use in the Makefile. It can be yacc, byacc, or bison -y.</p>
</li>
<li><a name="'yaccflags'"></a><b><code class="inline"><span class="w">yaccflags</span></code>
</b>
<p>From <i>yacc.U</i>:</p>
<p>This variable contains any additional yacc flags desired by the
user. It is up to the Makefile to use this.</p>
</li>
</ul>
<a name="z"></a><h2>z</h2>
<ul>
<li><a name="'zcat'"></a><b><code class="inline"><span class="w">zcat</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is defined but not used by Configure.
The value is a plain '' and is not useful.</p>
</li>
<li><a name="'zip'"></a><b><code class="inline"><span class="w">zip</span></code>
</b>
<p>From <i>Loc.U</i>:</p>
<p>This variable is used internally by Configure to determine the
full pathname (if any) of the zip program. After Configure runs,
the value is reset to a plain <code class="inline"><span class="w">zip</span></code>
and is not useful.</p>
</li>
</ul>
<a name="NOTE"></a><h1>NOTE</h1>
<p>This module contains a good example of how to use tie to implement a
cache and an example of how to make a tied variable readonly to those
outside of it.</p>
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