--- old/src/os_cpu/linux_zero/vm/os_linux_zero.hpp	2010-11-16 18:06:26.000000000 +0100
+++ new/src/os_cpu/linux_zero/vm/os_linux_zero.hpp	2010-11-16 18:06:26.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2007, 2008, 2010 Red Hat, Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -23,6 +23,9 @@
  *
  */
 
+#ifndef OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
+#define OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
+
   static void setup_fpu() {}
 
   static bool is_allocatable(size_t bytes);
@@ -49,3 +52,5 @@
     *(jlong *) dst = *(jlong *) src;
 #endif
   }
+
+#endif // OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP