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diff --git a/boost/filesystem/detail/macro_value.hpp b/boost/filesystem/detail/macro_value.hpp
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+//  boost/filesystem/detail/macro_value.hpp  -------------------------------------------//
+
+//  (C) Copyright John Maddock 2001 - 2003 
+//  (C) Copyright Jens Maurer 2001 
+//  (C) Copyright Peter Dimov 2001 
+//  (C) Copyright Darin Adler 2001 
+//  (C) Copyright Beman Dawes 2002 
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+//  Library home page: http://www.boost.org/libs/filesystem
+
+//--------------------------------------------------------------------------------------// 
+
+#ifndef BOOST_FILESYSTEM_MACRO_VALUE_HPP
+#define BOOST_FILESYSTEM_MACRO_VALUE_HPP
+
+#include <boost/config.hpp>
+#include <boost/assert.hpp>
+#include <cstdlib>
+
+namespace boost
+{
+  namespace detail
+  {
+    inline const char* macro_value(const char* name, const char* value)
+    {
+      static const char* no_value = "[no value]";
+      static const char* not_defined = "[not defined]";
+
+      BOOST_ASSERT_MSG(name, "name argument must not be a null pointer");
+      BOOST_ASSERT_MSG(value, "value argument must not be a null pointer");
+
+      return strcmp(name, value + 1) 
+        ? ((*value && *(value+1)) ? (value+1) : no_value)
+        : not_defined; // name == value+1 so the macro is not defined
+    }
+  }  // detail
+}  // boost
+
+#define BOOST_MACRO_VALUE(X) boost::detail::macro_value(#X, BOOST_STRINGIZE(=X))
+
+#endif  // BOOST_FILESYSTEM_MACRO_VALUE_HPP