Index: config.hpp
===================================================================
--- config.hpp	(Revision 56628)
+++ config.hpp	(Revision 56629)
@@ -89,6 +89,9 @@
 #     undef BOOST_CHRONO_HAS_THREAD_CLOCK
 #     undef BOOST_CHRONO_THREAD_CLOCK_IS_STEADY
 #   endif
+#   if defined(__VXWORKS__)
+#     undef BOOST_CHRONO_HAS_PROCESS_CLOCKS
+#   endif
 # endif
 
 #if defined(BOOST_CHRONO_THREAD_DISABLED) && defined(BOOST_CHRONO_HAS_THREAD_CLOCK)