--- old/src/share/vm/gc_implementation/shared/generationCounters.hpp	2010-10-28 13:56:09.000000000 +0200
+++ new/src/share/vm/gc_implementation/shared/generationCounters.hpp	2010-10-28 13:56:09.000000000 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2004, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 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 +22,12 @@
  *
  */
 
+#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP
+
+#include "runtime/perfData.hpp"
+#include "runtime/virtualspace.hpp"
+
 // A GenerationCounter is a holder class for performance counters
 // that track a generation
 
@@ -60,3 +66,5 @@
 
   const char* name_space() const        { return _name_space; }
 };
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP