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/mpl/aux_/has_apply.hpp b/ndnboost/mpl/aux_/has_apply.hpp
new file mode 100644
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--- /dev/null
+++ b/ndnboost/mpl/aux_/has_apply.hpp
@@ -0,0 +1,32 @@
+
+#ifndef BOOST_MPL_AUX_HAS_APPLY_HPP_INCLUDED
+#define BOOST_MPL_AUX_HAS_APPLY_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2004
+//
+// 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/mpl for documentation.
+
+// $Id: has_apply.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#include <ndnboost/mpl/has_xxx.hpp>
+#include <ndnboost/mpl/aux_/config/has_apply.hpp>
+
+namespace ndnboost { namespace mpl { namespace aux {
+#if !defined(BOOST_MPL_CFG_NO_HAS_APPLY)
+BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_apply, apply, false)
+#else
+template< typename T, typename fallback_ = false_ >
+struct has_apply
+ : fallback_
+{
+};
+#endif
+}}}
+
+#endif // BOOST_MPL_AUX_HAS_APPLY_HPP_INCLUDED