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/function/function2.hpp b/ndnboost/function/function2.hpp
new file mode 100644
index 0000000..65dbfda
--- /dev/null
+++ b/ndnboost/function/function2.hpp
@@ -0,0 +1,12 @@
+// Boost.Function library
+
+// Copyright Douglas Gregor 2002-2003. 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)
+
+// For more information, see http://www.boost.org
+
+#define BOOST_FUNCTION_NUM_ARGS 2
+#include <ndnboost/function/detail/maybe_include.hpp>
+#undef BOOST_FUNCTION_NUM_ARGS