--- old/src/share/vm/runtime/extendedPC.hpp	2010-11-16 18:19:16.000000000 +0100
+++ new/src/share/vm/runtime/extendedPC.hpp	2010-11-16 18:19:15.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,9 @@
  *
  */
 
+#ifndef SHARE_VM_RUNTIME_EXTENDEDPC_HPP
+#define SHARE_VM_RUNTIME_EXTENDEDPC_HPP
+
 // An ExtendedPC contains the _pc from a signal handler in a platform
 // independent way.
 
@@ -34,3 +37,5 @@
   ExtendedPC(address pc) { _pc  = pc;   }
   ExtendedPC()           { _pc  = NULL; }
 };
+
+#endif // SHARE_VM_RUNTIME_EXTENDEDPC_HPP