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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ac_var_timezone_externals
</title>
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<hr>
<h1>
ac_var_timezone_externals
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_VAR_TIMEZONE_EXTERNALS</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Use instead of `AC_STRUCT_TIMEZONE' to determine whether the the external
timezone variables `timezone', `altzone' and `daylight' exist, defining
`HAVE_TIMEZONE', `HAVE_ALTZONE' and `HAVE_DAYLIGHT' respectively (as well
as gaining the macros defined by `AC_STRUCT_TIMEZONE').
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Mark R.Bannister <markb@freedomware.co.uk>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2002-01-04
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_VAR_TIMEZONE_EXTERNALS],
[ AC_REQUIRE([AC_STRUCT_TIMEZONE])dnl
AC_CACHE_CHECK(for timezone external, mb_cv_var_timezone,
[ AC_TRY_LINK([#include <time.h>], [return (int)timezone;],
mb_cv_var_timezone=yes,
mb_cv_var_timezone=no)
])
AC_CACHE_CHECK(for altzone external, mb_cv_var_altzone,
[ AC_TRY_LINK([#include <time.h>], [return (int)altzone;],
mb_cv_var_altzone=yes,
mb_cv_var_altzone=no)
])
AC_CACHE_CHECK(for daylight external, mb_cv_var_daylight,
[ AC_TRY_LINK([#include <time.h>], [return (int)daylight;],
mb_cv_var_daylight=yes,
mb_cv_var_daylight=no)
])
if test $mb_cv_var_timezone = yes; then
AC_DEFINE([HAVE_TIMEZONE], 1,
[Define if you have the external `timezone' variable.])
fi
if test $mb_cv_var_altzone = yes; then
AC_DEFINE([HAVE_ALTZONE], 1,
[Define if you have the external `altzone' variable.])
fi
if test $mb_cv_var_daylight = yes; then
AC_DEFINE([HAVE_DAYLIGHT], 1,
[Define if you have the external `daylight' variable.])
fi
])
</pre>
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