diff --git a/lemon/glpk.h b/lemon/glpk.h
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+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2008
+ * 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.
+ *
+ */
+
+#ifndef LEMON_GLPK_H
+#define LEMON_GLPK_H
+
+///\file
+///\brief Header of the LEMON-GLPK lp solver interface.
+///\ingroup lp_group
+
+#include <lemon/lp_base.h>
+
+// forward declaration
+#if !defined _GLP_PROB && !defined GLP_PROB
+#define _GLP_PROB
+#define GLP_PROB
+typedef struct { double _opaque_prob; } glp_prob;
+/* LP/MIP problem object */
+#endif
+
+namespace lemon {
+
+
+  /// \brief Base interface for the GLPK LP and MIP solver
+  ///
+  /// This class implements the common interface of the GLPK LP and MIP solver.
+  /// \ingroup lp_group
+  class GlpkBase : virtual public LpBase {
+  protected:
+
+    typedef glp_prob LPX;
+    glp_prob* lp;
+
+    GlpkBase();
+    GlpkBase(const GlpkBase&);
+    virtual ~GlpkBase();
+
+  protected:
+
+    virtual int _addCol();
+    virtual int _addRow();
+    virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u);
+
+    virtual void _eraseCol(int i);
+    virtual void _eraseRow(int i);
+
+    virtual void _eraseColId(int i);
+    virtual void _eraseRowId(int i);
+
+    virtual void _getColName(int col, std::string& name) const;
+    virtual void _setColName(int col, const std::string& name);
+    virtual int _colByName(const std::string& name) const;
+
+    virtual void _getRowName(int row, std::string& name) const;
+    virtual void _setRowName(int row, const std::string& name);
+    virtual int _rowByName(const std::string& name) const;
+
+    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
+    virtual void _getRowCoeffs(int i, InsertIterator b) const;
+
+    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
+    virtual void _getColCoeffs(int i, InsertIterator b) const;
+
+    virtual void _setCoeff(int row, int col, Value value);
+    virtual Value _getCoeff(int row, int col) const;
+
+    virtual void _setColLowerBound(int i, Value value);
+    virtual Value _getColLowerBound(int i) const;
+
+    virtual void _setColUpperBound(int i, Value value);
+    virtual Value _getColUpperBound(int i) const;
+
+    virtual void _setRowLowerBound(int i, Value value);
+    virtual Value _getRowLowerBound(int i) const;
+
+    virtual void _setRowUpperBound(int i, Value value);
+    virtual Value _getRowUpperBound(int i) const;
+
+    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
+    virtual void _getObjCoeffs(InsertIterator b) const;
+
+    virtual void _setObjCoeff(int i, Value obj_coef);
+    virtual Value _getObjCoeff(int i) const;
+
+    virtual void _setSense(Sense);
+    virtual Sense _getSense() const;
+
+    virtual void _clear();
+
+    virtual void _messageLevel(MessageLevel level);
+
+  private:
+
+    static void freeEnv();
+
+    struct FreeEnvHelper {
+      ~FreeEnvHelper() {
+        freeEnv();
+      }
+    };
+    
+    static FreeEnvHelper freeEnvHelper;
+
+  protected:
+    
+    int _message_level;
+    
+  public:
+
+    ///Pointer to the underlying GLPK data structure.
+    LPX *lpx() {return lp;}
+    ///Const pointer to the underlying GLPK data structure.
+    const LPX *lpx() const {return lp;}
+
+    ///Returns the constraint identifier understood by GLPK.
+    int lpxRow(Row r) const { return rows(id(r)); }
+
+    ///Returns the variable identifier understood by GLPK.
+    int lpxCol(Col c) const { return cols(id(c)); }
+
+  };
+
+  /// \brief Interface for the GLPK LP solver
+  ///
+  /// This class implements an interface for the GLPK LP solver.
+  ///\ingroup lp_group
+  class GlpkLp : public LpSolver, public GlpkBase {
+  public:
+
+    ///\e
+    GlpkLp();
+    ///\e
+    GlpkLp(const GlpkLp&);
+
+    ///\e
+    virtual GlpkLp* cloneSolver() const;
+    ///\e
+    virtual GlpkLp* newSolver() const;
+
+  private:
+
+    mutable std::vector<double> _primal_ray;
+    mutable std::vector<double> _dual_ray;
+
+    void _clear_temporals();
+
+  protected:
+
+    virtual const char* _solverName() const;
+
+    virtual SolveExitStatus _solve();
+    virtual Value _getPrimal(int i) const;
+    virtual Value _getDual(int i) const;
+
+    virtual Value _getPrimalValue() const;
+
+    virtual VarStatus _getColStatus(int i) const;
+    virtual VarStatus _getRowStatus(int i) const;
+
+    virtual Value _getPrimalRay(int i) const;
+    virtual Value _getDualRay(int i) const;
+
+    virtual ProblemType _getPrimalType() const;
+    virtual ProblemType _getDualType() const;
+
+  public:
+
+    ///Solve with primal simplex
+    SolveExitStatus solvePrimal();
+
+    ///Solve with dual simplex
+    SolveExitStatus solveDual();
+
+  private:
+
+    bool _presolve;
+
+  public:
+
+    ///Turns on or off the presolver
+
+    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
+    ///
+    ///The presolver is off by default.
+    void presolver(bool presolve);
+
+  };
+
+  /// \brief Interface for the GLPK MIP solver
+  ///
+  /// This class implements an interface for the GLPK MIP solver.
+  ///\ingroup lp_group
+  class GlpkMip : public MipSolver, public GlpkBase {
+  public:
+
+    ///\e
+    GlpkMip();
+    ///\e
+    GlpkMip(const GlpkMip&);
+
+    virtual GlpkMip* cloneSolver() const;
+    virtual GlpkMip* newSolver() const;
+
+  protected:
+
+    virtual const char* _solverName() const;
+
+    virtual ColTypes _getColType(int col) const;
+    virtual void _setColType(int col, ColTypes col_type);
+
+    virtual SolveExitStatus _solve();
+    virtual ProblemType _getType() const;
+    virtual Value _getSol(int i) const;
+    virtual Value _getSolValue() const;
+
+  };
+
+
+} //END OF NAMESPACE LEMON
+
+#endif //LEMON_GLPK_H
+