$NetBSD: patch-ap,v 1.3 2013/03/24 16:51:08 joerg Exp $

--- CommonUtilitiesLib/OSRef.h.orig	2007-02-15 23:13:47.000000000 +0000
+++ CommonUtilitiesLib/OSRef.h
@@ -58,6 +58,9 @@ class OSRefTableUtils
         friend class OSRefKey;
 };
 
+// defined below
+class OSRefKey;
+
 class OSRef
 {
     public: