add boost on mac

macx64/include/boost/graph/parallel/simple_trigger.hpp

@@ -0,0 +1,13 @@
+// Copyright (C) 2007 Douglas Gregor 
+
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// This file contains a simplification of the "trigger" method for
+// process groups. The simple trigger handles the common case where
+// the handler associated with a trigger is a member function bound to
+// a particular pointer.
+
+// File moved
+#include <boost/property_map/parallel/simple_trigger.hpp>