diff -r e33f46fc48ed -r f95d63e2154a src/cpu/x86/vm/c1_Defs_x86.hpp
--- a/src/cpu/x86/vm/c1_Defs_x86.hpp	Tue Nov 23 15:01:43 2010 -0500
+++ b/src/cpu/x86/vm/c1_Defs_x86.hpp	Tue Nov 23 13:22:55 2010 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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 CPU_X86_VM_C1_DEFS_X86_HPP
+#define CPU_X86_VM_C1_DEFS_X86_HPP
+
 // native word offsets from memory address (little endian)
 enum {
   pd_lo_word_offset_in_bytes = 0,
@@ -71,3 +74,5 @@
 enum {
   pd_float_saved_as_double = true
 };
+
+#endif // CPU_X86_VM_C1_DEFS_X86_HPP