--- old/src/share/vm/runtime/os.hpp	2015-12-01 16:57:53.954853987 +0100
+++ new/src/share/vm/runtime/os.hpp	2015-12-01 16:57:53.779836444 +0100
@@ -473,6 +473,7 @@
 
   static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
   static frame      fetch_frame_from_context(void* ucVoid);
+  static frame      fetch_frame_from_ucontext(Thread* thread, void* ucVoid);
 
   static ExtendedPC get_thread_pc(Thread *thread);
   static void breakpoint();