2 # Define 'timezone', 'altzone' and 'daylight'
3 # http://www.gnu.org/software/ac-archive/Miscellaneous/ac_var_timezone_externals.html
4 # Use instead of 'AC_STRUCT_TIMEZONE' to determine whether the
5 # the external timezone variables 'timezone', 'altzone' and 'daylight' exist,
6 # defining 'HAVE_TIMEZONE', 'HAVE_ALTZONE' and 'HAVE_DAYLIGHT' respectively
7 # (as well as gaining the macros defined by 'AC_STRUCT_TIMEZONE').
8 # Mark R.Bannister <markb@freedomware.co.uk>
9 AC_DEFUN([AC_VAR_TIMEZONE_EXTERNALS],
10 [ AC_REQUIRE([AC_STRUCT_TIMEZONE])dnl
11 AC_CACHE_CHECK(for timezone external, mb_cv_var_timezone,
12 [ AC_TRY_LINK([#include <time.h>], [return (int)timezone;],
13 mb_cv_var_timezone=yes,
14 mb_cv_var_timezone=no)
16 AC_CACHE_CHECK(for altzone external, mb_cv_var_altzone,
17 [ AC_TRY_LINK([#include <time.h>], [return (int)altzone;],
18 mb_cv_var_altzone=yes,
21 AC_CACHE_CHECK(for daylight external, mb_cv_var_daylight,
22 [ AC_TRY_LINK([#include <time.h>], [return (int)daylight;],
23 mb_cv_var_daylight=yes,
24 mb_cv_var_daylight=no)
26 if test $mb_cv_var_timezone = yes; then
27 AC_DEFINE([HAVE_TIMEZONE], 1,
28 [Define if you have the external 'timezone' variable.])
30 if test $mb_cv_var_altzone = yes; then
31 AC_DEFINE([HAVE_ALTZONE], 1,
32 [Define if you have the external 'altzone' variable.])
34 if test $mb_cv_var_daylight = yes; then
35 AC_DEFINE([HAVE_DAYLIGHT], 1,
36 [Define if you have the external 'daylight' variable.])