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diff --git a/lemon/lemon/lp_base.cc b/lemon/lemon/lp_base.cc
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+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2010
+ * 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.
+ *
+ */
+
+///\file
+///\brief The implementation of the LP solver interface.
+
+#include <lemon/lp_base.h>
+namespace lemon {
+
+  const LpBase::Value LpBase::INF =
+    std::numeric_limits<LpBase::Value>::infinity();
+  const LpBase::Value LpBase::NaN =
+    std::numeric_limits<LpBase::Value>::quiet_NaN();
+
+} //namespace lemon