$NetBSD: patch-aa,v 1.2 2014/11/02 09:31:17 makoto Exp $

--- callback.c.orig	2014-11-02 11:49:29.000000000 +0900
+++ callback.c	2014-11-02 11:49:46.000000000 +0900
@@ -13,6 +13,7 @@
  * Callback implementation.
  */
 #include "callback.h"
+#include <stdio.h>
 #include <string.h>
 
 #ifndef CALLBACK_NATIVE