add boost on mac

macx64/include/boost/contract/detail/config.hpp

@@ -0,0 +1,26 @@
+
+#ifndef BOOST_CONTRACT_DETAIL_CONFIG_HPP_
+#define BOOST_CONTRACT_DETAIL_CONFIG_HPP_
+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+#include <boost/preprocessor/cat.hpp>
+
+// Turn off BOOST_ASSERT(...) in lib's implementation (always on by default).
+// BOOST_CONTRACT_DETAIL_NDEBUG
+
+#ifndef BOOST_CONTRACT_DETAIL_NAME_INFIX
+    // Do not use underscore "_" to avoid generating reserved names with "__".
+    #define BOOST_CONTRACT_DETAIL_NAME_INFIX X
+#endif
+
+#ifndef BOOST_CONTRACT_DETAIL_NAME_PREFIX
+    #define BOOST_CONTRACT_DETAIL_NAME_PREFIX \
+        BOOST_PP_CAT(boost_contract_detail, BOOST_CONTRACT_DETAIL_NAME_INFIX)
+#endif
+
+#endif // #include guard
+