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/call_traits.hpp b/ndnboost/call_traits.hpp
new file mode 100644
index 0000000..aefeeff
--- /dev/null
+++ b/ndnboost/call_traits.hpp
@@ -0,0 +1,24 @@
+// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
+// Use, modification and distribution are 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/utility for most recent version including documentation.
+
+// See boost/detail/call_traits.hpp and boost/detail/ob_call_traits.hpp
+// for full copyright notices.
+
+#ifndef BOOST_CALL_TRAITS_HPP
+#define BOOST_CALL_TRAITS_HPP
+
+#ifndef BOOST_CONFIG_HPP
+#include <ndnboost/config.hpp>
+#endif
+
+#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+#include <ndnboost/detail/ob_call_traits.hpp>
+#else
+#include <ndnboost/detail/call_traits.hpp>
+#endif
+
+#endif // BOOST_CALL_TRAITS_HPP