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diff --git a/boost/spirit/home/x3/support/numeric_utils/sign.hpp b/boost/spirit/home/x3/support/numeric_utils/sign.hpp
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+++ b/boost/spirit/home/x3/support/numeric_utils/sign.hpp
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+/*=============================================================================
+    Copyright (c) 2001-2014 Joel de Guzman
+    Copyright (c) 2001-2011 Hartmut Kaiser
+    http://spirit.sourceforge.net/
+
+    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)
+=============================================================================*/
+#if !defined(SPIRIT_SIGN_MAR_11_2009_0734PM)
+#define SPIRIT_SIGN_MAR_11_2009_0734PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config/no_tr1/cmath.hpp>
+#include <boost/math/special_functions/fpclassify.hpp>
+#include <boost/math/special_functions/sign.hpp>
+
+namespace boost { namespace spirit { namespace x3
+{
+    template<typename T>
+    inline bool (signbit)(T x)
+    {
+        return (boost::math::signbit)(x) ? true : false;
+    }
+
+    // This routine has been taken and adapted from Johan Rade's fp_traits
+    // library
+    template<typename T>
+    inline T (changesign)(T x)
+    {
+#if defined(BOOST_MATH_USE_STD_FPCLASSIFY) && !defined(BOOST_MATH_DISABLE_STD_FPCLASSIFY)
+        return -x;
+#else
+        typedef typename math::detail::fp_traits<T>::type traits_type;
+
+        typename traits_type::bits a;
+        traits_type::get_bits(x, a);
+        a ^= traits_type::sign;
+        traits_type::set_bits(x, a);
+        return x;
+#endif
+    }
+
+}}}
+
+#endif