many *.m4 files: improve m4 quoting

[gnulib.git] / m4 / getdomainname.m4

diff --git a/m4/getdomainname.m4 b/m4/getdomainname.m4
index 744d646..94a8717 100644 (file)
--- a/m4/getdomainname.m4
+++ b/m4/getdomainname.m4
@@ -1,15 +1,19 @@
-# getdomainname.m4 serial 1
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# getdomainname.m4 serial 4
+dnl Copyright (C) 2002-2003, 2008, 2009 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_GETDOMAINNAME],
 [
-  AC_REPLACE_FUNCS(getdomainname)
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+  dnl Persuade glibc <unistd.h> to declare getdomainname().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REPLACE_FUNCS([getdomainname])
   if test $ac_cv_func_getdomainname = no; then
+    HAVE_GETDOMAINNAME=0
     gl_PREREQ_GETDOMAINNAME
   fi
 ])