* lib/sys_time_.h: Use a recursion-safe inclusion guard rather than

[gnulib.git] / m4 / strdup.m4

diff --git a/m4/strdup.m4 b/m4/strdup.m4
index bb38f25..8796e9e 100644 (file)
--- a/m4/strdup.m4
+++ b/m4/strdup.m4
@@ -1,4 +1,4 @@
-# strdup.m4 serial 8
+# strdup.m4 serial 9
 
 dnl Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
 dnl Foundation, Inc.
@@ -9,6 +9,7 @@ dnl with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_FUNC_STRDUP],
 [
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
   AC_REPLACE_FUNCS(strdup)
   AC_CHECK_DECLS_ONCE(strdup)
   if test $ac_cv_have_decl_strdup = no; then