X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fwcpncpy.m4;h=a4d73e28d8364f357dc962478f355be532b9fcd8;hb=39e1adf83f9afbbc1ab9edbd6ca3d509c1f1bec4;hp=939e8808f7a3ee359d5b2289ba4aa560130a1705;hpb=49549725af344962f45720d4d332d9cf0699ebcd;p=gnulib.git

diff --git a/m4/wcpncpy.m4 b/m4/wcpncpy.m4
index 939e8808f..a4d73e28d 100644
--- a/m4/wcpncpy.m4
+++ b/m4/wcpncpy.m4
@@ -1,4 +1,4 @@
-# wcpncpy.m4 serial 1
+# wcpncpy.m4 serial 2
 dnl Copyright (C) 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,
@@ -7,6 +7,10 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_WCPNCPY],
 [
   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+
+  dnl Persuade glibc <wchar.h> to declare wcpncpy().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
   AC_CHECK_FUNCS_ONCE([wcpncpy])
   if test $ac_cv_func_wcpncpy = no; then
     HAVE_WCPNCPY=0