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diff --git a/boost/units/systems/si/energy.hpp b/boost/units/systems/si/energy.hpp
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+++ b/boost/units/systems/si/energy.hpp
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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and 
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// 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)
+
+#ifndef BOOST_UNITS_SI_ENERGY_HPP
+#define BOOST_UNITS_SI_ENERGY_HPP
+
+#include <boost/units/systems/si/base.hpp>
+#include <boost/units/physical_dimensions/energy.hpp>
+
+namespace boost {
+
+namespace units { 
+
+namespace si {
+
+typedef unit<energy_dimension,si::system>    energy;
+    
+BOOST_UNITS_STATIC_CONSTANT(joule,energy);  
+BOOST_UNITS_STATIC_CONSTANT(joules,energy); 
+
+} // namespace si
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_SI_ENERGY_HPP