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diff --git a/boost_ext/boost/parameter/aux_/parameter_requirements.hpp b/boost_ext/boost/parameter/aux_/parameter_requirements.hpp
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+// Copyright Daniel Wallin, David Abrahams 2005. Use, modification and
+// distribution is subject to 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 PARAMETER_REQUIREMENTS_050331_HPP
+#define PARAMETER_REQUIREMENTS_050331_HPP
+
+namespace boost { namespace parameter { namespace aux {
+
+// Used to pass static information about parameter requirements
+// through the satisfies() overload set (below).  The
+// matched function is never invoked, but its type indicates whether
+// a parameter matches at compile-time
+template <class Keyword, class Predicate, class HasDefault>
+struct parameter_requirements
+{
+    typedef Keyword keyword;
+    typedef Predicate predicate;
+    typedef HasDefault has_default;
+};
+
+}}} // namespace boost::parameter::aux
+
+#endif // PARAMETER_REQUIREMENTS_050331_HPP