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diff --git a/boost/metaparse/v1/error/unpaired.hpp b/boost/metaparse/v1/error/unpaired.hpp
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+++ b/boost/metaparse/v1/error/unpaired.hpp
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+#ifndef BOOST_METAPARSE_V1_ERROR_UNPAIRED_HPP
+#define BOOST_METAPARSE_V1_ERROR_UNPAIRED_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu)  2015.
+// 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)
+
+#include <boost/mpl/vector.hpp>
+
+#include <iostream>
+#include <string>
+#include <sstream>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      namespace error
+      {
+        template <int Line, int Col, class Msg = boost::mpl::na>
+        struct unpaired
+        {
+          typedef unpaired type;
+
+          static std::string get_value()
+          {
+            std::ostringstream s;
+            s << Msg::get_value() << " (see " << Line << ":" << Col << ")";
+            return s.str();
+          }
+        };
+
+        template <int Line, int Col>
+        struct unpaired<Line, Col, boost::mpl::na>
+        {
+          typedef unpaired type;
+
+          template <class Msg = boost::mpl::na>
+          struct apply : unpaired<Line, Col, Msg> {};
+        };
+      }
+    }
+  }
+}
+
+#endif
+