--- user.bak	2017-07-11 17:23:18.950071100 +0000
+++ user.hpp	2017-07-11 17:24:32.366928300 +0000
@@ -120,5 +120,7 @@
 // that feature off.
 // #define BOOST_WHATEVER_NO_LIB
  
+#define BOOST_ASIO_DISABLE_FENCED_BLOCK 
+#define BOOST_SP_USE_SPINLOCK