diff --git a/lemon/concept_check.h b/lemon/concept_check.h
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--- /dev/null
+++ b/lemon/concept_check.h
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+/* -*- C++ -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2003-2007
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+// Modified for use in LEMON.
+// We should really consider using Boost...
+
+//
+// (C) Copyright Jeremy Siek 2000.
+// 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)
+//
+// Revision History:
+//   05 May   2001: Workarounds for HP aCC from Thomas Matelich. (Jeremy Siek)
+//   02 April 2001: Removed limits header altogether. (Jeremy Siek)
+//   01 April 2001: Modified to use new <boost/limits.hpp> header. (JMaddock)
+//
+
+// See http://www.boost.org/libs/concept_check for documentation.
+
+#ifndef LEMON_BOOST_CONCEPT_CHECKS_HPP
+#define LEMON_BOOST_CONCEPT_CHECKS_HPP
+
+namespace lemon {
+
+  /*
+    "inline" is used for ignore_unused_variable_warning()
+    and function_requires() to make sure there is no
+    overtarget with g++.
+  */
+
+  template <class T> inline void ignore_unused_variable_warning(const T&) { }
+
+  template <class Concept>
+  inline void function_requires()
+  {
+#if !defined(NDEBUG)
+    void (Concept::*x)() = & Concept::constraints;
+    ignore_unused_variable_warning(x);
+#endif
+  }
+
+  template <typename Concept, typename Type>
+  inline void checkConcept() {
+#if !defined(NDEBUG)
+    typedef typename Concept::template Constraints<Type> ConceptCheck;
+    void (ConceptCheck::*x)() = & ConceptCheck::constraints;
+    ignore_unused_variable_warning(x);
+#endif
+  }
+
+#define BOOST_CLASS_REQUIRE(type_var, ns, concept) \
+  typedef void (ns::concept <type_var>::* func##type_var##concept)(); \
+  template <func##type_var##concept Tp1_> \
+  struct concept_checking_##type_var##concept { }; \
+  typedef concept_checking_##type_var##concept< \
+    BOOST_FPTR ns::concept<type_var>::constraints> \
+    concept_checking_typedef_##type_var##concept
+
+#define BOOST_CLASS_REQUIRE2(type_var1, type_var2, ns, concept) \
+  typedef void (ns::concept <type_var1,type_var2>::* \
+     func##type_var1##type_var2##concept)(); \
+  template <func##type_var1##type_var2##concept Tp1_> \
+  struct concept_checking_##type_var1##type_var2##concept { }; \
+  typedef concept_checking_##type_var1##type_var2##concept< \
+    BOOST_FPTR ns::concept<type_var1,type_var2>::constraints> \
+    concept_checking_typedef_##type_var1##type_var2##concept
+
+#define BOOST_CLASS_REQUIRE3(tv1, tv2, tv3, ns, concept) \
+  typedef void (ns::concept <tv1,tv2,tv3>::* \
+     func##tv1##tv2##tv3##concept)(); \
+  template <func##tv1##tv2##tv3##concept Tp1_> \
+  struct concept_checking_##tv1##tv2##tv3##concept { }; \
+  typedef concept_checking_##tv1##tv2##tv3##concept< \
+    BOOST_FPTR ns::concept<tv1,tv2,tv3>::constraints> \
+    concept_checking_typedef_##tv1##tv2##tv3##concept
+
+#define BOOST_CLASS_REQUIRE4(tv1, tv2, tv3, tv4, ns, concept) \
+  typedef void (ns::concept <tv1,tv2,tv3,tv4>::* \
+     func##tv1##tv2##tv3##tv4##concept)(); \
+  template <func##tv1##tv2##tv3##tv4##concept Tp1_> \
+  struct concept_checking_##tv1##tv2##tv3##tv4##concept { }; \
+  typedef concept_checking_##tv1##tv2##tv3##tv4##concept< \
+    BOOST_FPTR ns::concept<tv1,tv2,tv3,tv4>::constraints> \
+    concept_checking_typedef_##tv1##tv2##tv3##tv4##concept
+
+
+} // namespace lemon
+
+#endif // LEMON_BOOST_CONCEPT_CHECKS_HPP