--- old/src/cpu/zero/vm/frame_zero.hpp	2010-11-10 12:59:13.000000000 +0100
+++ new/src/cpu/zero/vm/frame_zero.hpp	2010-11-10 12:59:12.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -23,6 +23,12 @@
  *
  */
 
+#ifndef CPU_ZERO_VM_FRAME_ZERO_HPP
+#define CPU_ZERO_VM_FRAME_ZERO_HPP
+
+#include "runtime/synchronizer.hpp"
+#include "utilities/top.hpp"
+
 // A frame represents a physical stack frame on the Zero stack.
 
  public:
@@ -72,3 +78,5 @@
                            outputStream* st,
                            char*         buf,
                            int           buflen) const;
+
+#endif // CPU_ZERO_VM_FRAME_ZERO_HPP