-# obstack-printf.m4 serial 1
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# obstack-printf.m4 serial 2
+dnl Copyright (C) 2008, 2009, 2010 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([gl_FUNC_OBSTACK_PRINTF],
[
+ dnl Persuade glibc <stdio.h> to declare obstack_printf(), obstack_vprintf().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([obstack_printf])
if test $ac_cv_func_obstack_printf = no ; then