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diff --git a/boost/geometry/srs/projections/impl/adjlon.hpp b/boost/geometry/srs/projections/impl/adjlon.hpp
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+++ b/boost/geometry/srs/projections/impl/adjlon.hpp
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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+// This file is manually converted from PROJ4
+
+// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
+
+// 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)
+
+// This file is converted from PROJ4, http://trac.osgeo.org/proj
+// PROJ4 is originally written by Gerald Evenden (then of the USGS)
+// PROJ4 is maintained by Frank Warmerdam
+// PROJ4 is converted to Geometry Library by Barend Gehrels (Geodan, Amsterdam)
+
+// Original copyright notice:
+
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef BOOST_GEOMETRY_PROJECTIONS_IMPL_ADJLON_HPP
+#define BOOST_GEOMETRY_PROJECTIONS_IMPL_ADJLON_HPP
+
+#include <boost/math/constants/constants.hpp>
+#include <boost/geometry/util/math.hpp>
+
+namespace boost { namespace geometry { namespace projections
+{
+
+namespace detail
+{
+
+/* reduce argument to range +/- PI */
+template <typename T>
+inline T adjlon (T lon)
+{
+    if (geometry::math::abs(lon) <= boost::math::constants::pi<T>())
+    {
+        return lon;
+    }
+
+    /* adjust to 0..2pi rad */
+    lon += boost::math::constants::pi<T>();
+    /* remove integral # of 'revolutions'*/
+    lon -= boost::math::constants::two_pi<T>() *
+                std::floor(lon / boost::math::constants::two_pi<T>());
+    /* adjust back to -pi..pi rad */
+    lon -= boost::math::constants::pi<T>();
+
+    return lon;
+}
+
+} // namespace detail
+}}} // namespace boost::geometry::projections
+
+#endif // BOOST_GEOMETRY_PROJECTIONS_IMPL_ADJLON_HPP