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diff --git a/boost/dynamic_bitset/config.hpp b/boost/dynamic_bitset/config.hpp
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+++ b/boost/dynamic_bitset/config.hpp
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+// -----------------------------------------------------------
+//
+//   Copyright (c) 2001-2002 Chuck Allison and Jeremy Siek
+//        Copyright (c) 2003-2006, 2008 Gennaro Prota
+//
+// 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_DYNAMIC_BITSET_CONFIG_HPP_GP_20040424
+#define BOOST_DYNAMIC_BITSET_CONFIG_HPP_GP_20040424
+
+#include "boost/config.hpp"
+#include "boost/detail/workaround.hpp"
+
+// support for pre 3.0 libstdc++ - thanks Phil Edwards!
+#if defined (__STL_CONFIG_H) && !defined (__STL_USE_NEW_IOSTREAMS)
+# define BOOST_OLD_IOSTREAMS
+#endif
+
+// no-op function to workaround gcc bug c++/8419
+//
+namespace boost { namespace detail {
+    template <typename T> T make_non_const(T t) { return t; }
+}}
+
+#if defined(__GNUC__)
+# define BOOST_DYNAMIC_BITSET_WRAP_CONSTANT(expr) \
+         (boost::detail::make_non_const(expr))
+#else
+# define BOOST_DYNAMIC_BITSET_WRAP_CONSTANT(expr) (expr)
+#endif
+
+//
+#if (defined __BORLANDC__ && BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)))  \
+                             || (defined BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
+#define BOOST_DYNAMIC_BITSET_DONT_USE_FRIENDS
+#endif
+
+// if we can't use friends then we simply expose private members
+//
+#if defined(BOOST_DYNAMIC_BITSET_DONT_USE_FRIENDS)
+#define BOOST_DYNAMIC_BITSET_PRIVATE public
+#else
+#define BOOST_DYNAMIC_BITSET_PRIVATE private
+#endif
+
+// A couple of macros to cope with libraries without locale
+// support. The first macro must be used to declare a reference
+// to a ctype facet. The second one to widen a char by using
+// that ctype object. If facets and locales aren't available
+// the first macro is a no-op and the second one just expands
+// to its parameter c.
+//
+#if defined (BOOST_USE_FACET)
+
+#define BOOST_DYNAMIC_BITSET_CTYPE_FACET(ch, name, loc)     \
+            const std::ctype<ch> & name =                   \
+            BOOST_USE_FACET(std::ctype<ch>, loc)         /**/
+
+#define BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, c)             \
+           (fac.widen(c))
+#else
+
+#define BOOST_DYNAMIC_BITSET_CTYPE_FACET(ch, name, loc) /**/
+#define BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, c)          c
+
+#endif
+
+#endif // include guard