-# getsubopt.m4 serial 3
+# getsubopt.m4 serial 4
dnl Copyright (C) 2004, 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_GETSUBOPT],
[
dnl Persuade glibc <stdlib.h> to declare getsubopt().
- AC_REQUIRE([AC_GNU_SOURCE])
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([getsubopt])