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/none_t.hpp b/ndnboost/none_t.hpp
new file mode 100644
index 0000000..baf3004
--- /dev/null
+++ b/ndnboost/none_t.hpp
@@ -0,0 +1,24 @@
+// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
+//
+// Use, modification, and distribution is subject to 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/optional for documentation.
+//
+// You are welcome to contact the author at:
+// fernando_cacciola@hotmail.com
+//
+#ifndef BOOST_NONE_T_17SEP2003_HPP
+#define BOOST_NONE_T_17SEP2003_HPP
+
+namespace ndnboost {
+
+namespace detail { struct none_helper{}; }
+
+typedef int detail::none_helper::*none_t ;
+
+} // namespace ndnboost
+
+#endif
+