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diff --git a/boost/property_map/parallel/detail/untracked_pair.hpp b/boost/property_map/parallel/detail/untracked_pair.hpp
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+++ b/boost/property_map/parallel/detail/untracked_pair.hpp
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+// Copyright (C) 2007 Matthias Troyer
+//
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//
+// This file contains helper data structures for use in transmitting
+// properties. The basic idea is to optimize away any storage for the
+// properties when no properties are specified.
+#ifndef BOOST_PARALLEL_DETAIL_UNTRACKED_PAIR_HPP
+#define BOOST_PARALLEL_DETAIL_UNTRACKED_PAIR_HPP
+
+#include <boost/mpi/datatype.hpp>
+#include <utility> // for std::pair
+#include <boost/serialization/utility.hpp>
+
+namespace boost { namespace parallel { namespace detail {
+
+/**
+ * This structure is like std::pair, with the only difference
+ * that tracking in the serialization library is turned off.
+ */
+ 
+template<typename T, typename U>
+struct untracked_pair : public std::pair<T,U>
+{
+  untracked_pair() {}
+
+  untracked_pair(const T& t, const U& u)
+  : std::pair<T,U>(t,u) {}
+
+  template<class T1, class U1>
+  untracked_pair(std::pair<T1,U1> const& p)
+  : std::pair<T,U>(p) {}  
+};
+
+template<typename T, typename U>
+inline untracked_pair<T, U>
+make_untracked_pair(const T& t, const U& u)
+{
+  return untracked_pair<T,U>(t,u);
+}
+
+} } } // end namespace boost::parallel::detail
+
+namespace boost { namespace mpi {
+
+template<typename T, typename U>
+struct is_mpi_datatype<boost::parallel::detail::untracked_pair<T, U> >
+  : is_mpi_datatype<std::pair<T,U> > {};
+
+} } // end namespace boost::mpi
+
+namespace boost { namespace serialization {
+
+// pair
+template<class Archive, class F, class S>
+inline void serialize(
+    Archive & ar,
+    boost::parallel::detail::untracked_pair<F, S> & p,
+    const unsigned int /* file_version */
+){
+    ar & boost::serialization::make_nvp("first", p.first);
+    ar & boost::serialization::make_nvp("second", p.second);
+}
+
+template<typename T, typename U>
+struct is_bitwise_serializable<
+        boost::parallel::detail::untracked_pair<T, U> >
+  : is_bitwise_serializable<std::pair<T, U> > {};
+
+template<typename T, typename U>
+struct implementation_level<boost::parallel::detail::untracked_pair<T, U> >
+ : mpl::int_<object_serializable> {} ;
+
+template<typename T, typename U>
+struct tracking_level<boost::parallel::detail::untracked_pair<T, U> >
+ : mpl::int_<track_never> {} ;
+
+} } // end namespace boost::serialization
+
+#endif // BOOST_PARALLEL_DETAIL_UNTRACKED_PAIR_HPP