diff --git a/ndnboost/type_traits/make_unsigned.hpp b/ndnboost/type_traits/make_unsigned.hpp
new file mode 100644
index 0000000..f7be5a8
--- /dev/null
+++ b/ndnboost/type_traits/make_unsigned.hpp
@@ -0,0 +1,153 @@
+
+//  (C) Copyright John Maddock 2007.
+//  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/type_traits for most recent version including documentation.
+
+#ifndef BOOST_TT_MAKE_UNSIGNED_HPP_INCLUDED
+#define BOOST_TT_MAKE_UNSIGNED_HPP_INCLUDED
+
+#include <ndnboost/mpl/if.hpp>
+#include <ndnboost/type_traits/is_integral.hpp>
+#include <ndnboost/type_traits/is_signed.hpp>
+#include <ndnboost/type_traits/is_unsigned.hpp>
+#include <ndnboost/type_traits/is_enum.hpp>
+#include <ndnboost/type_traits/is_same.hpp>
+#include <ndnboost/type_traits/remove_cv.hpp>
+#include <ndnboost/type_traits/is_const.hpp>
+#include <ndnboost/type_traits/is_volatile.hpp>
+#include <ndnboost/type_traits/add_const.hpp>
+#include <ndnboost/type_traits/add_volatile.hpp>
+#include <ndnboost/type_traits/detail/ice_or.hpp>
+#include <ndnboost/type_traits/detail/ice_and.hpp>
+#include <ndnboost/type_traits/detail/ice_not.hpp>
+#include <ndnboost/static_assert.hpp>
+
+// should be the last #include
+#include <ndnboost/type_traits/detail/type_trait_def.hpp>
+
+namespace ndnboost {
+
+namespace detail {
+
+template <class T>
+struct make_unsigned_imp
+{
+   BOOST_STATIC_ASSERT(
+      (::ndnboost::type_traits::ice_or< ::ndnboost::is_integral<T>::value, ::ndnboost::is_enum<T>::value>::value));
+#if !BOOST_WORKAROUND(BOOST_MSVC, <=1300)
+   BOOST_STATIC_ASSERT(
+      (::ndnboost::type_traits::ice_not< ::ndnboost::is_same<
+         typename remove_cv<T>::type, bool>::value>::value));
+#endif
+
+   typedef typename remove_cv<T>::type t_no_cv;
+   typedef typename mpl::if_c<
+      (::ndnboost::type_traits::ice_and< 
+         ::ndnboost::is_unsigned<T>::value,
+         ::ndnboost::is_integral<T>::value,
+         ::ndnboost::type_traits::ice_not< ::ndnboost::is_same<t_no_cv, char>::value>::value,
+         ::ndnboost::type_traits::ice_not< ::ndnboost::is_same<t_no_cv, wchar_t>::value>::value,
+         ::ndnboost::type_traits::ice_not< ::ndnboost::is_same<t_no_cv, bool>::value>::value >::value),
+      T,
+      typename mpl::if_c<
+         (::ndnboost::type_traits::ice_and< 
+            ::ndnboost::is_integral<T>::value,
+            ::ndnboost::type_traits::ice_not< ::ndnboost::is_same<t_no_cv, char>::value>::value,
+            ::ndnboost::type_traits::ice_not< ::ndnboost::is_same<t_no_cv, wchar_t>::value>::value,
+            ::ndnboost::type_traits::ice_not< ::ndnboost::is_same<t_no_cv, bool>::value>::value>
+         ::value),
+         typename mpl::if_<
+            is_same<t_no_cv, signed char>,
+            unsigned char,
+            typename mpl::if_<
+               is_same<t_no_cv, short>,
+               unsigned short,
+               typename mpl::if_<
+                  is_same<t_no_cv, int>,
+                  unsigned int,
+                  typename mpl::if_<
+                     is_same<t_no_cv, long>,
+                     unsigned long,
+#if defined(BOOST_HAS_LONG_LONG)
+#ifdef BOOST_HAS_INT128
+                     typename mpl::if_c<
+                        sizeof(t_no_cv) == sizeof(ndnboost::ulong_long_type), 
+                        ndnboost::ulong_long_type, 
+                        ndnboost::uint128_type
+                     >::type
+#else
+                     ndnboost::ulong_long_type
+#endif
+#elif defined(BOOST_HAS_MS_INT64)
+                     unsigned __int64
+#else
+                     unsigned long
+#endif
+                  >::type
+               >::type
+            >::type
+         >::type,
+         // Not a regular integer type:
+         typename mpl::if_c<
+            sizeof(t_no_cv) == sizeof(unsigned char),
+            unsigned char,
+            typename mpl::if_c<
+               sizeof(t_no_cv) == sizeof(unsigned short),
+               unsigned short,
+               typename mpl::if_c<
+                  sizeof(t_no_cv) == sizeof(unsigned int),
+                  unsigned int,
+                  typename mpl::if_c<
+                     sizeof(t_no_cv) == sizeof(unsigned long),
+                     unsigned long,
+#if defined(BOOST_HAS_LONG_LONG)
+#ifdef BOOST_HAS_INT128
+                     typename mpl::if_c<
+                        sizeof(t_no_cv) == sizeof(ndnboost::ulong_long_type), 
+                        ndnboost::ulong_long_type, 
+                        ndnboost::uint128_type
+                     >::type
+#else
+                     ndnboost::ulong_long_type
+#endif
+#elif defined(BOOST_HAS_MS_INT64)
+                     unsigned __int64
+#else
+                     unsigned long
+#endif
+                  >::type
+               >::type
+            >::type
+         >::type
+      >::type
+   >::type base_integer_type;
+   
+   // Add back any const qualifier:
+   typedef typename mpl::if_<
+      is_const<T>,
+      typename add_const<base_integer_type>::type,
+      base_integer_type
+   >::type const_base_integer_type;
+   
+   // Add back any volatile qualifier:
+   typedef typename mpl::if_<
+      is_volatile<T>,
+      typename add_volatile<const_base_integer_type>::type,
+      const_base_integer_type
+   >::type type;
+};
+
+
+} // namespace detail
+
+BOOST_TT_AUX_TYPE_TRAIT_DEF1(make_unsigned,T,typename ndnboost::detail::make_unsigned_imp<T>::type)
+
+} // namespace ndnboost
+
+#include <ndnboost/type_traits/detail/type_trait_undef.hpp>
+
+#endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
+