In common.h, define func_lib for function objects. In configure.ac, define HAVE_STD_FUNCTION and HAVE_BOOST_FUNCTION. Include function headers in ndnboost.
diff --git a/ndnboost/unordered_set.hpp b/ndnboost/unordered_set.hpp
new file mode 100644
index 0000000..76a462d
--- /dev/null
+++ b/ndnboost/unordered_set.hpp
@@ -0,0 +1,18 @@
+
+// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
+// Copyright (C) 2005-2008 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/unordered for documentation
+
+#ifndef BOOST_UNORDERED_SET_HPP_INCLUDED
+#define BOOST_UNORDERED_SET_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/unordered/unordered_set.hpp>
+
+#endif // BOOST_UNORDERED_SET_HPP_INCLUDED