-# strdup.m4 serial 8
+# strdup.m4 serial 9
dnl Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
dnl Foundation, Inc.
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