environ.m4
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environ.m4
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	# environ.m4 serial 5
	dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc.
	dnl This file is free software; the Free Software Foundation
	dnl gives unlimited permission to copy and/or distribute it,
	dnl with or without modifications, as long as this notice is preserved.

	AC_DEFUN_ONCE([gl_ENVIRON],
	[
	AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
	dnl Persuade glibc <unistd.h> to declare environ.
	AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
	gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
	if test $gt_cv_var_environ_declaration != yes; then
	HAVE_DECL_ENVIRON=0
	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_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	[[$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_]m4_translit($2, [a-z], [A-Z])[_DECL], 1,
	[Define if you have the declaration of $2.])
	fi
	undefine([gt_cv_var])
	])