--- /dev/null
+# setenv.m4 serial 4
+dnl Copyright (C) 2001-2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License. As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+AC_DEFUN([gt_FUNC_SETENV],
+[
+ AC_REPLACE_FUNCS(setenv unsetenv)
+ if test $ac_cv_func_setenv = no; then
+ gl_PREREQ_SETENV
+ fi
+ if test $ac_cv_func_unsetenv = no; then
+ gl_PREREQ_UNSETENV
+ fi
+])
+
+# Check if a variable is properly declared.
+# gt_CHECK_VAR_DECL(includes,variable)
+AC_DEFUN([gt_CHECK_VAR_DECL],
+[
+ define([gt_cv_var], [gt_cv_var_]$2[_declaration])
+ AC_MSG_CHECKING([if $2 is properly declared])
+ AC_CACHE_VAL(gt_cv_var, [
+ AC_TRY_COMPILE([$1
+ extern struct { int foo; } $2;],
+ [$2.foo = 1;],
+ gt_cv_var=no,
+ gt_cv_var=yes)])
+ AC_MSG_RESULT($gt_cv_var)
+ if test $gt_cv_var = yes; then
+ AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
+ [Define if you have the declaration of $2.])
+ fi
+])
+
+# Prerequisites of lib/setenv.c.
+AC_DEFUN([gl_PREREQ_SETENV],
+[
+ AC_REQUIRE([AC_FUNC_ALLOCA])
+ AC_CHECK_HEADERS_ONCE(unistd.h)
+ AC_CHECK_HEADERS(search.h)
+ AC_CHECK_FUNCS(tsearch)
+ gt_CHECK_VAR_DECL([#include <errno.h>], errno)
+ gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
+])
+
+# Prerequisites of lib/unsetenv.c.
+AC_DEFUN([gl_PREREQ_UNSETENV],
+[
+ AC_CHECK_HEADERS_ONCE(unistd.h)
+ gt_CHECK_VAR_DECL([#include <errno.h>], errno)
+ gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
+])