add boost on mac

macx64/include/boost/spirit/home/qi/directive/encoding.hpp

@@ -0,0 +1,32 @@
+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+
+    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)
+=============================================================================*/
+#if !defined(SPIRIT_ENCODING_MARCH_05_2010_0528PM)
+#define SPIRIT_ENCODING_MARCH_05_2010_0528PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/qi/meta_compiler.hpp>
+#include <boost/spirit/home/support/common_terminals.hpp>
+
+namespace boost { namespace spirit
+{
+    ///////////////////////////////////////////////////////////////////////////
+    // Enablers
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename CharEncoding>
+    struct use_directive<
+        qi::domain, tag::char_code<tag::encoding, CharEncoding> > // enables encoding
+      : mpl::true_ {};
+
+    template <typename CharEncoding>
+    struct is_modifier_directive<qi::domain, tag::char_code<tag::encoding, CharEncoding> >
+      : mpl::true_ {};
+}}
+
+#endif