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diff --git a/ext/boost/concept/detail/has_constraints.hpp b/ext/boost/concept/detail/has_constraints.hpp
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+++ b/ext/boost/concept/detail/has_constraints.hpp
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+// Copyright David Abrahams 2006. 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_CONCEPT_DETAIL_HAS_CONSTRAINTS_DWA2006429_HPP
+# define BOOST_CONCEPT_DETAIL_HAS_CONSTRAINTS_DWA2006429_HPP
+
+# include <boost/mpl/bool.hpp>
+# include <boost/detail/workaround.hpp>
+namespace boost { namespace concept {
+
+namespace detail
+{ 
+
+// Here we implement the metafunction that detects whether a
+// constraints metafunction exists
+  typedef char yes;
+  typedef char (&no)[2];
+
+  template <class Model, void (Model::*)()>
+  struct wrap_constraints {};
+    
+#if BOOST_WORKAROUND(__SUNPRO_CC, <= 0x580)
+  // Work around the following bogus error in Sun Studio 11, by
+  // turning off the has_constraints function entirely:
+  //    Error: complex expression not allowed in dependent template
+  //    argument expression
+  inline no has_constraints_(...);
+#else
+  template <class Model>
+  inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
+  inline no has_constraints_(...);
+#endif
+}
+
+// This would be called "detail::has_constraints," but it has a strong
+// tendency to show up in error messages.
+template <class Model>
+struct not_satisfied
+{
+    BOOST_STATIC_CONSTANT(
+        bool
+      , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
+    typedef mpl::bool_<value> type;
+};
+
+}} // namespace boost::concept::detail
+
+#endif // BOOST_CONCEPT_DETAIL_HAS_CONSTRAINTS_DWA2006429_HPP