2 dnl Copyright (C) 2001-2003 Free Software Foundation, Inc.
3 dnl This file is free software, distributed under the terms of the GNU
4 dnl General Public License. As a special exception to the GNU General
5 dnl Public License, this file may be distributed as part of a program
6 dnl that contains a configuration script generated by Autoconf, under
7 dnl the same distribution terms as the rest of that program.
9 AC_DEFUN([gt_FUNC_SETENV],
11 AC_REPLACE_FUNCS(setenv unsetenv)
12 if test $ac_cv_func_setenv = no; then
15 if test $ac_cv_func_unsetenv = no; then
20 # Check if a variable is properly declared.
21 # gt_CHECK_VAR_DECL(includes,variable)
22 AC_DEFUN([gt_CHECK_VAR_DECL],
24 define([gt_cv_var], [gt_cv_var_]$2[_declaration])
25 AC_MSG_CHECKING([if $2 is properly declared])
26 AC_CACHE_VAL(gt_cv_var, [
28 extern struct { int foo; } $2;],
32 AC_MSG_RESULT($gt_cv_var)
33 if test $gt_cv_var = yes; then
34 AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
35 [Define if you have the declaration of $2.])
39 # Prerequisites of lib/setenv.c.
40 AC_DEFUN([gl_PREREQ_SETENV],
42 AC_REQUIRE([AC_FUNC_ALLOCA])
43 AC_CHECK_HEADERS_ONCE(unistd.h)
44 AC_CHECK_HEADERS(search.h)
45 AC_CHECK_FUNCS(tsearch)
46 gt_CHECK_VAR_DECL([#include <errno.h>], errno)
47 gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
50 # Prerequisites of lib/unsetenv.c.
51 AC_DEFUN([gl_PREREQ_UNSETENV],
53 AC_CHECK_HEADERS_ONCE(unistd.h)
54 gt_CHECK_VAR_DECL([#include <errno.h>], errno)
55 gt_CHECK_VAR_DECL([#include <unistd.h>], environ)