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diff --git a/src/boost/libs/math/test/almost_equal.ipp b/src/boost/libs/math/test/almost_equal.ipp
new file mode 100644
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+++ b/src/boost/libs/math/test/almost_equal.ipp
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+#ifndef BOOST_MATH_ALMOST_EQUAL_HPP
+#define BOOST_MATH_ALMOST_EQUAL_HPP
+
+// Copyright (c) 2006 Johan Rade
+
+// 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)
+
+#include <cmath>
+
+template<class ValType>
+bool almost_equal(ValType a, ValType b)
+{
+    const ValType e = static_cast<ValType>(0.00001);
+    return (a - e * std::abs(a) <= b + e * std::abs(b))
+        && (a + e * std::abs(a) >= b - e * std::abs(b));
+}
+
+#endif