--- old/src/share/vm/runtime/os.hpp	2013-09-13 16:51:25.000000000 -0700
+++ new/src/share/vm/runtime/os.hpp	2013-09-13 16:51:25.000000000 -0700
@@ -91,6 +91,8 @@
 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
 
 class os: AllStatic {
+  friend class VMStructs;
+
  public:
   enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)