--- old/src/os/linux/vm/os_linux.hpp	2010-11-10 13:00:12.000000000 +0100
+++ new/src/os/linux/vm/os_linux.hpp	2010-11-10 13:00:11.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2009, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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 OS_LINUX_VM_OS_LINUX_HPP
+#define OS_LINUX_VM_OS_LINUX_HPP
+
 // Linux_OS defines the interface to Linux operating systems
 
 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
@@ -328,3 +331,5 @@
       assert_status(status == 0, status, "mutex_init");
     }
 } ;
+
+#endif // OS_LINUX_VM_OS_LINUX_HPP