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diff --git a/nix/boost/format/macros_default.hpp b/nix/boost/format/macros_default.hpp
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+// -*- C++ -*-
+//  Boost general library 'format'   ---------------------------
+//  See http://www.boost.org for updates, documentation, and revision history.
+
+//  (C) Samuel Krempp 2001
+//                  krempp@crans.ens-cachan.fr
+//  Permission to copy, use, modify, sell and
+//  distribute this software is granted provided this copyright notice appears
+//  in all copies. This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+
+// ideas taken from Rüdiger Loos's format class
+// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
+
+// ------------------------------------------------------------------------------
+// macros_default.hpp : configuration for the format library
+//                       provides default values for the stl workaround macros
+// ------------------------------------------------------------------------------
+
+#ifndef BOOST_FORMAT_MACROS_DEFAULT_HPP
+#define BOOST_FORMAT_MACROS_DEFAULT_HPP
+
+// *** This should go to "boost/config/suffix.hpp".
+
+#ifndef BOOST_IO_STD
+#  define BOOST_IO_STD std::
+#endif
+
+// **** Workaround for io streams, stlport and msvc.
+#ifdef BOOST_IO_NEEDS_USING_DECLARATION
+namespace boost {
+  using std::char_traits;
+  using std::basic_ostream;
+  using std::basic_ostringstream;
+  namespace io {
+    using std::basic_ostream;
+    namespace detail {
+      using std::basic_ios;
+      using std::basic_ostream;
+      using std::basic_ostringstream;
+    }
+  }
+}
+#endif
+
+// ------------------------------------------------------------------------------
+
+#endif // BOOST_FORMAT_MACROS_DEFAULT_HPP