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_/at_impl.hpp b/ndnboost/mpl/aux_/at_impl.hpp
new file mode 100644
index 0000000..5d2f235
--- /dev/null
+++ b/ndnboost/mpl/aux_/at_impl.hpp
@@ -0,0 +1,45 @@
+
+#ifndef BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
+#define BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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: at_impl.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/begin_end.hpp>
+#include <ndnboost/mpl/advance.hpp>
+#include <ndnboost/mpl/deref.hpp>
+#include <ndnboost/mpl/aux_/traits_lambda_spec.hpp>
+
+namespace ndnboost { namespace mpl {
+
+// default implementation; conrete sequences might override it by
+// specializing either the 'at_impl' or the primary 'at' template
+
+template< typename Tag >
+struct at_impl
+{
+ template< typename Sequence, typename N > struct apply
+ {
+ typedef typename advance<
+ typename begin<Sequence>::type
+ , N
+ >::type iter_;
+
+ typedef typename deref<iter_>::type type;
+ };
+};
+
+BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, at_impl)
+
+}}
+
+#endif // BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED