--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m4/strndup.m4	Fri Jul 23 17:18:52 2010 -0600
@@ -0,0 +1,49 @@
+# strndup.m4 serial 17
+dnl Copyright (C) 2002-2003, 2005-2010 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_STRNDUP],
+[
+  dnl Persuade glibc <string.h> to declare strndup().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_CHECK_DECLS_ONCE([strndup])
+  AC_CHECK_FUNCS_ONCE([strndup])
+  if test $ac_cv_have_decl_strndup = no; then
+    HAVE_DECL_STRNDUP=0
+  fi
+
+  if test $ac_cv_func_strndup = yes; then
+    # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
+    AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup_works],
+      [AC_RUN_IFELSE([
+         AC_LANG_PROGRAM([[#include <string.h>
+                           #include <stdlib.h>]], [[
+#ifndef HAVE_DECL_STRNDUP
+  extern char *strndup (const char *, size_t);
+#endif
+  char *s;
+  s = strndup ("some longer string", 15);
+  free (s);
+  s = strndup ("shorter string", 13);
+  return s[13] != '\0';]])],
+         [gl_cv_func_strndup_works=yes],
+         [gl_cv_func_strndup_works=no],
+         [case $host_os in
+            aix*) gl_cv_func_strndup_works="guessing no";;
+            *) gl_cv_func_strndup_works="guessing yes";;
+          esac])])
+    case $gl_cv_func_strndup_works in
+      *no)
+        REPLACE_STRNDUP=1
+        AC_LIBOBJ([strndup])
+        ;;
+    esac
+  else
+    AC_LIBOBJ([strndup])
+  fi
+])