// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
-#include <boost/metaparse/v1/impl/concat.hpp>
+#include <boost/metaparse/config.hpp>
+
+#if BOOST_METAPARSE_STD >= 2011
+
+#include <boost/metaparse/v1/cpp11/impl/concat.hpp>
#include <boost/metaparse/string.hpp>
#include <boost/mpl/equal_to.hpp>
));
}
+#endif