X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fobstack-printf.m4;h=969d62027c5413b80103f2571bd2ae5efe4ab673;hb=f4afe5cea2bcafa496240334283ac7e280b20a0a;hp=98860c2e666640761666dbe3589383094be42ac2;hpb=7a8101a246b1c7aa64cd2f95ad2a43a2bf2ee891;p=gnulib.git

diff --git a/m4/obstack-printf.m4 b/m4/obstack-printf.m4
index 98860c2e6..969d62027 100644
--- a/m4/obstack-printf.m4
+++ b/m4/obstack-printf.m4
@@ -1,4 +1,4 @@
-# obstack-printf.m4 serial 1
+# obstack-printf.m4 serial 2
 dnl Copyright (C) 2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -10,6 +10,9 @@ dnl obstack_vprintf behaves identically, so we only test for one.
 
 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