ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/detail/config/unreachable_return.hpp b/include/ndnboost/iostreams/detail/config/unreachable_return.hpp
new file mode 100644
index 0000000..1de856a
--- /dev/null
+++ b/include/ndnboost/iostreams/detail/config/unreachable_return.hpp
@@ -0,0 +1,25 @@
+// (C) Copyright 2010 Daniel James
+// 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.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#ifndef NDNBOOST_IOSTREAMS_DETAIL_UNREACHABLE_RETURN_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_DETAIL_UNREACHABLE_RETURN_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/config.hpp>
+
+// If Boost.Exception has NDNBOOST_ATTRIBUTE_NORETURN
+#if defined(_MSC_VER) || defined(__GNUC__)
+#define NDNBOOST_IOSTREAMS_UNREACHABLE_RETURN(x) \
+ NDNBOOST_UNREACHABLE_RETURN(x)
+#else
+#define NDNBOOST_IOSTREAMS_UNREACHABLE_RETURN(x) \
+ return x;
+#endif
+
+#endif