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diff --git a/boost/serialization/unique_ptr.hpp b/boost/serialization/unique_ptr.hpp
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+#ifndef  BOOST_SERIALIZATION_UNIQUE_PTR_HPP
+#define BOOST_SERIALIZATION_UNIQUE_PTR_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// unique_ptr.hpp:
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
+// 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)
+
+//  See http://www.boost.org for updates, documentation, and revision history.
+#include <memory>
+#include <boost/serialization/split_free.hpp>
+#include <boost/serialization/nvp.hpp>
+
+namespace boost {
+namespace serialization {
+
+/////////////////////////////////////////////////////////////
+// implement serialization for unique_ptr< T >
+// note: this must be added to the boost namespace in order to
+// be called by the library
+template<class Archive, class T>
+inline void save(
+    Archive & ar,
+    const std::unique_ptr< T > &t,
+    const unsigned int file_version
+){
+    // only the raw pointer has to be saved
+    // the ref count is rebuilt automatically on load
+    const T * const tx = t.get();
+    ar << BOOST_SERIALIZATION_NVP(tx);
+}
+
+template<class Archive, class T>
+inline void load(
+    Archive & ar,
+    std::unique_ptr< T > &t,
+    const unsigned int file_version
+){
+    T *tx;
+    ar >> BOOST_SERIALIZATION_NVP(tx);
+    // note that the reset automagically maintains the reference count
+    t.reset(tx);
+}
+
+// split non-intrusive serialization function member into separate
+// non intrusive save/load member functions
+template<class Archive, class T>
+inline void serialize(
+    Archive & ar,
+    std::unique_ptr< T > &t,
+    const unsigned int file_version
+){
+    boost::serialization::split_free(ar, t, file_version);
+}
+
+} // namespace serialization
+} // namespace boost
+
+
+#endif // BOOST_SERIALIZATION_UNIQUE_PTR_HPP