ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/functional/hash.hpp b/include/ndnboost/functional/hash.hpp
new file mode 100644
index 0000000..bcc68bc
--- /dev/null
+++ b/include/ndnboost/functional/hash.hpp
@@ -0,0 +1,7 @@
+
+// Copyright 2005-2009 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)
+
+#include <ndnboost/functional/hash/hash.hpp>
+