--- old/src/os/linux/vm/os_share_linux.hpp	2010-10-28 13:49:27.000000000 +0200
+++ new/src/os/linux/vm/os_share_linux.hpp	2010-10-28 13:49:27.000000000 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2003, 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_SHARE_LINUX_HPP
+#define OS_LINUX_VM_OS_SHARE_LINUX_HPP
+
 // misc
 void signalHandler(int, siginfo_t*, ucontext_t*);
 void handle_unexpected_exception(Thread* thread, int sig, siginfo_t* info, address pc, address adjusted_pc);
@@ -30,3 +33,5 @@
 #endif
 
 #define PROCFILE_LENGTH 128
+
+#endif // OS_LINUX_VM_OS_SHARE_LINUX_HPP