diff --git a/boost/mpl/if.hpp b/boost/mpl/if.hpp
new file mode 100644
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--- /dev/null
+++ b/boost/mpl/if.hpp
@@ -0,0 +1,135 @@
+
+#ifndef BOOST_MPL_IF_HPP_INCLUDED
+#define BOOST_MPL_IF_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: if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#include <boost/mpl/aux_/value_wknd.hpp>
+#include <boost/mpl/aux_/static_cast.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+#include <boost/mpl/aux_/lambda_support.hpp>
+#include <boost/mpl/aux_/config/integral.hpp>
+#include <boost/mpl/aux_/config/ctps.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+namespace ndnboost { namespace mpl {
+
+#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+
+template<
+      bool C
+    , typename T1
+    , typename T2
+    >
+struct if_c
+{
+    typedef T1 type;
+};
+
+template<
+      typename T1
+    , typename T2
+    >
+struct if_c<false,T1,T2>
+{
+    typedef T2 type;
+};
+
+// agurt, 05/sep/04: nondescriptive parameter names for the sake of DigitalMars
+// (and possibly MWCW < 8.0); see http://article.gmane.org/gmane.comp.lib.boost.devel/108959
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(T1)
+    , typename BOOST_MPL_AUX_NA_PARAM(T2)
+    , typename BOOST_MPL_AUX_NA_PARAM(T3)
+    >
+struct if_
+{
+ private:
+    // agurt, 02/jan/03: two-step 'type' definition for the sake of aCC 
+    typedef if_c<
+#if defined(BOOST_MPL_CFG_BCC_INTEGRAL_CONSTANTS)
+          BOOST_MPL_AUX_VALUE_WKND(T1)::value
+#else
+          BOOST_MPL_AUX_STATIC_CAST(bool, BOOST_MPL_AUX_VALUE_WKND(T1)::value)
+#endif
+        , T2
+        , T3
+        > almost_type_;
+ 
+ public:
+    typedef typename almost_type_::type type;
+    
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(T1,T2,T3))
+};
+
+#else
+
+// no partial class template specialization
+
+namespace aux {
+
+template< bool C >
+struct if_impl
+{
+    template< typename T1, typename T2 > struct result_
+    {
+        typedef T1 type;
+    };
+};
+
+template<>
+struct if_impl<false>
+{
+    template< typename T1, typename T2 > struct result_
+    { 
+        typedef T2 type;
+    };
+};
+
+} // namespace aux
+
+template<
+      bool C_
+    , typename T1
+    , typename T2
+    >
+struct if_c
+{
+    typedef typename aux::if_impl< C_ >
+        ::template result_<T1,T2>::type type;
+};
+
+// (almost) copy & paste in order to save one more 
+// recursively nested template instantiation to user
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(C_)
+    , typename BOOST_MPL_AUX_NA_PARAM(T1)
+    , typename BOOST_MPL_AUX_NA_PARAM(T2)
+    >
+struct if_
+{
+    enum { msvc_wknd_ = BOOST_MPL_AUX_MSVC_VALUE_WKND(C_)::value };
+
+    typedef typename aux::if_impl< BOOST_MPL_AUX_STATIC_CAST(bool, msvc_wknd_) >
+        ::template result_<T1,T2>::type type;
+
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
+};
+
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+BOOST_MPL_AUX_NA_SPEC(3, if_)
+
+}}
+
+#endif // BOOST_MPL_IF_HPP_INCLUDED