add boost on mac

macx64/include/boost/metaparse/v1/cpp11/impl/concat.hpp

@@ -0,0 +1,30 @@
+#ifndef BOOST_METAPARSE_V1_CPP11_IMPL_CONCAT_HPP
+#define BOOST_METAPARSE_V1_CPP11_IMPL_CONCAT_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu)  2013.
+// Distributed under 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)
+
+#include <boost/metaparse/v1/cpp11/fwd/string.hpp>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      namespace impl
+      {
+        template <class A, class B>
+        struct concat;
+
+        template <char... As, char... Bs>
+        struct concat<string<As...>, string<Bs...>> : string<As..., Bs...> {};
+      }
+    }
+  }
+}
+
+#endif
+