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<h3 class="appendixsec">F.1 Installation Problems</h3>
<p>This section contains a list of problems (and some apparent problems
that don't really mean anything is wrong) that may show up during
installation of Octave.
<ul>
<li>On some SCO systems, <code>info</code> fails to compile if
<code>HAVE_TERMIOS_H</code><!-- /@w --> is defined in <samp><span class="file">config.h</span></samp>. Simply removing
the definition from <samp><span class="file">info/config.h</span></samp> should allow it to compile.
<li>If <code>configure</code> finds <code>dlopen</code>, <code>dlsym</code>, <code>dlclose</code>,
and <code>dlerror</code>, but not the header file <samp><span class="file">dlfcn.h</span></samp>, you need to
find the source for the header file and install it in the directory
<samp><span class="file">usr/include</span></samp>. This is reportedly a problem with Slackware 3.1.
For Linux/GNU systems, the source for <samp><span class="file">dlfcn.h</span></samp> is in the
<code>ldso</code> package.
<li>Building <samp><span class="file">.oct</span></samp> files doesn't work.
<p>You should probably have a shared version of <code>libstdc++</code>. A patch
is needed to build shared versions of version 2.7.2 of <code>libstdc++</code>
on the HP-PA architecture. You can find the patch at
<a href="ftp://ftp.cygnus.com/pub/g++/libg++-2.7.2-hppa-gcc-fix">ftp://ftp.cygnus.com/pub/g++/libg++-2.7.2-hppa-gcc-fix</a>.
<li>On some alpha systems there may be a problem with the <code>libdxml</code>
library, resulting in floating point errors and/or segmentation faults in
the linear algebra routines called by Octave. If you encounter such
problems, then you should modify the configure script so that
<code>SPECIAL_MATH_LIB</code><!-- /@w --> is not set to <code>-ldxml</code>.
<li>On FreeBSD systems Octave may hang while initializing some internal
constants. The fix appears to be to use
<pre class="example"> options GPL_MATH_EMULATE
</pre>
<p class="noindent">rather than
<pre class="example"> options MATH_EMULATE
</pre>
<p class="noindent">in the kernel configuration files (typically found in the directory
<samp><span class="file">/sys/i386/conf</span></samp>. After making this change, you'll need to rebuild
the kernel, install it, and reboot.
<li>If you encounter errors like
<pre class="example"> passing `void (*)()' as argument 2 of
`octave_set_signal_handler(int, void (*)(int))'
</pre>
<p class="noindent">or
<pre class="example"> warning: ANSI C++ prohibits conversion from `(int)'
to `(...)'
</pre>
<p class="noindent">while compiling <samp><span class="file">sighandlers.cc</span></samp>, you may need to edit some files
in the <code>gcc</code> include subdirectory to add proper prototypes for functions
there. For example, Ultrix 4.2 needs proper declarations for the
<code>signal</code> function and the <code>SIG_IGN</code><!-- /@w --> macro in the file
<samp><span class="file">signal.h</span></samp>.
<p>On some systems the <code>SIG_IGN</code><!-- /@w --> macro is defined to be something like
this:
<pre class="example"> #define SIG_IGN (void (*)())1
</pre>
<p class="noindent">when it should really be something like:
<pre class="example"> #define SIG_IGN (void (*)(int))1
</pre>
<p class="noindent">to match the prototype declaration for the <code>signal</code> function. This
change should also be made for the <code>SIG_DFL</code><!-- /@w --> and <code>SIG_ERR</code><!-- /@w -->
symbols. It may be necessary to change the definitions in
<samp><span class="file">sys/signal.h</span></samp> as well.
<p>The <code>gcc</code> <code>fixincludes</code> and <code>fixproto</code> scripts should
probably fix these problems when <code>gcc</code> installs its modified set of
header files, but I don't think that's been done yet.
<p><strong>You should not change the files in </strong><samp><span class="file">/usr/include</span></samp>. You
can find the <code>gcc</code> include directory tree by running the command
<pre class="example"> gcc -print-libgcc-file-name
</pre>
<p class="noindent">The directory of <code>gcc</code> include files normally begins in the same directory
that contains the file <samp><span class="file">libgcc.a</span></samp>.
<li>Some of the Fortran subroutines may fail to compile with older versions
of the Sun Fortran compiler. If you get errors like
<pre class="example"> zgemm.f:
zgemm:
warning: unexpected parent of complex expression subtree
zgemm.f, line 245: warning: unexpected parent of complex
expression subtree
warning: unexpected parent of complex expression subtree
zgemm.f, line 304: warning: unexpected parent of complex
expression subtree
warning: unexpected parent of complex expression subtree
zgemm.f, line 327: warning: unexpected parent of complex
expression subtree
pcc_binval: missing IR_CONV in complex op
make[2]: *** [zgemm.o] Error 1
</pre>
<p class="noindent">when compiling the Fortran subroutines in the <samp><span class="file">libcruft</span></samp>
subdirectory, you should either upgrade your compiler or try compiling
with optimization turned off.
<li>On NeXT systems, if you get errors like this:
<pre class="example"> /usr/tmp/cc007458.s:unknown:Undefined local
symbol LBB7656
/usr/tmp/cc007458.s:unknown:Undefined local
symbol LBE7656
</pre>
<p class="noindent">when compiling <samp><span class="file">Array.cc</span></samp> and <samp><span class="file">Matrix.cc</span></samp>, try recompiling
these files without <code>-g</code>.
<li>Some people have reported that calls to shell_cmd and the pager do not
work on SunOS systems. This is apparently due to having
<code>G_HAVE_SYS_WAIT</code><!-- /@w --> defined to be 0 instead of 1 when compiling
<code>libg++</code>.
<li>On NeXT systems, linking to <samp><span class="file">libsys_s.a</span></samp> may fail to resolve the
following functions
<pre class="example"> _tcgetattr
_tcsetattr
_tcflow
</pre>
<p class="noindent">which are part of <samp><span class="file">libposix.a</span></samp>. Unfortunately, linking Octave with
<code>-posix</code> results in the following undefined symbols.
<pre class="example"> .destructors_used
.constructors_used
_objc_msgSend
_NXGetDefaultValue
_NXRegisterDefaults
.objc_class_name_NXStringTable
.objc_class_name_NXBundle
</pre>
<p>One kluge around this problem is to extract <samp><span class="file">termios.o</span></samp> from
<samp><span class="file">libposix.a</span></samp>, put it in Octave's <samp><span class="file">src</span></samp> directory, and add it
to the list of files to link together in the makefile. Suggestions for
better ways to solve this problem are welcome!
<li>If Octave crashes immediately with a floating point exception, it is
likely that it is failing to initialize the IEEE floating point values
for infinity and NaN.
<p>If your system actually does support IEEE arithmetic, you should be able
to fix this problem by modifying the function <code>octave_ieee_init</code> in
the file <samp><span class="file">lo-ieee.cc</span></samp> to correctly initialize Octave's internal
infinity and NaN variables.
<p>If your system does not support IEEE arithmetic but Octave's configure
script incorrectly determined that it does, you can work around the
problem by editing the file <samp><span class="file">config.h</span></samp> to not define
<code>HAVE_ISINF</code><!-- /@w -->, <code>HAVE_FINITE</code><!-- /@w -->, and <code>HAVE_ISNAN</code><!-- /@w -->.
<p>In any case, please report this as a bug since it might be possible to
modify Octave's configuration script to automatically determine the
proper thing to do.
<li>If Octave is unable to find a header file because it is installed in a
location that is not normally searched by the compiler, you can add the
directory to the include search path by specifying (for example)
<code>CPPFLAGS=-I/some/nonstandard/directory</code> as an argument to
<code>configure</code>. Other variables that can be specified this way are
<code>CFLAGS</code>, <code>CXXFLAGS</code>, <code>FFLAGS</code>, and <code>LDFLAGS</code>.
Passing them as options to the configure script also records them in the
<samp><span class="file">config.status</span></samp> file. By default, <code>CPPFLAGS</code> and
<code>LDFLAGS</code> are empty, <code>CFLAGS</code> and <code>CXXFLAGS</code> are set to
<code>"-g -O"</code> and <code>FFLAGS</code> is set to <code>"-O"</code>.
</ul>
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