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diff --git a/boost/serialization/unordered_collections_save_imp.hpp b/boost/serialization/unordered_collections_save_imp.hpp
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+#ifndef BOOST_SERIALIZATION_UNORDERED_COLLECTIONS_SAVE_IMP_HPP
+#define BOOST_SERIALIZATION_UNORDERED_COLLECTIONS_SAVE_IMP_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// hash_collections_save_imp.hpp: serialization for stl collections
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
+// (C) Copyright 2014 Jim Bell
+// 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.
+
+// helper function templates for serialization of collections
+
+#include <boost/config.hpp>
+#include <boost/serialization/nvp.hpp>
+#include <boost/serialization/serialization.hpp>
+#include <boost/serialization/version.hpp>
+#include <boost/serialization/collection_size_type.hpp>
+#include <boost/serialization/item_version_type.hpp>
+
+namespace boost{
+namespace serialization {
+namespace stl {
+
+//////////////////////////////////////////////////////////////////////
+// implementation of serialization for STL containers
+//
+
+template<class Archive, class Container>
+inline void save_unordered_collection(Archive & ar, const Container &s)
+{
+    collection_size_type count(s.size());
+    const collection_size_type bucket_count(s.bucket_count());
+    const item_version_type item_version(
+        version<typename Container::value_type>::value
+    );
+
+    #if 0
+    /* should only be necessary to create archives of previous versions
+     * which is not currently supported.  So for now comment this out
+     */
+    boost::archive::library_version_type library_version(
+        ar.get_library_version()
+    );
+    // retrieve number of elements
+	ar << BOOST_SERIALIZATION_NVP(count);
+	ar << BOOST_SERIALIZATION_NVP(bucket_count);
+    if(boost::archive::library_version_type(3) < library_version){
+        // record number of elements
+        // make sure the target type is registered so we can retrieve
+        // the version when we load
+        ar << BOOST_SERIALIZATION_NVP(item_version);
+    }
+    #else
+        ar << BOOST_SERIALIZATION_NVP(count);
+        ar << BOOST_SERIALIZATION_NVP(bucket_count);
+        ar << BOOST_SERIALIZATION_NVP(item_version);
+    #endif
+
+    typename Container::const_iterator it = s.begin();
+    while(count-- > 0){
+        // note borland emits a no-op without the explicit namespace
+        boost::serialization::save_construct_data_adl(
+            ar, 
+            &(*it), 
+            boost::serialization::version<
+                typename Container::value_type
+            >::value
+        );
+        ar << boost::serialization::make_nvp("item", *it++);
+    }
+}
+
+} // namespace stl 
+} // namespace serialization
+} // namespace boost
+
+#endif //BOOST_SERIALIZATION_UNORDERED_COLLECTIONS_SAVE_IMP_HPP