diff --git a/lemon/mip_glpk.cc b/lemon/mip_glpk.cc
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+++ b/lemon/mip_glpk.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) 2003-2008
+ * 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.
+ *
+ */
+
+///\file
+///\brief Implementation of the LEMON-GLPK mip solver interface.
+
+#include <lemon/mip_glpk.h>
+
+extern "C" {
+#include <glpk.h>
+}
+
+#if GLP_MAJOR_VERSION > 4 || (GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION > 15)
+#define LEMON_glp(func) (glp_##func)
+#define LEMON_lpx(func) (lpx_##func)
+
+#define LEMON_GLP(def) (GLP_##def)
+#define LEMON_LPX(def) (LPX_##def)
+
+#else
+
+#define LEMON_glp(func) (lpx_##func)
+#define LEMON_lpx(func) (lpx_##func)
+
+#define LEMON_GLP(def) (LPX_##def)
+#define LEMON_LPX(def) (LPX_##def)
+
+#endif
+
+namespace lemon {
+
+  MipGlpk::MipGlpk() {
+#if !(GLP_MAJOR_VERSION > 4 || \
+      (GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION > 15))
+    LEMON_lpx(set_class)(lp,LEMON_GLP(MIP));
+#endif
+  }
+
+  void MipGlpk::_colType(int i, MipGlpk::ColTypes col_type){
+    switch (col_type){
+      case INT:
+        LEMON_glp(set_col_kind)(lp,i,LEMON_GLP(IV));
+        break;
+      case REAL:
+        LEMON_glp(set_col_kind)(lp,i,LEMON_GLP(CV));
+        break;
+    default:;
+        //FIXME problem
+    }
+  }
+
+  MipGlpk::ColTypes MipGlpk::_colType(int i) const {
+    switch (LEMON_glp(get_col_kind)(lp,i)){
+    case LEMON_GLP(IV):
+      return INT;//Or binary
+    case LEMON_GLP(CV):
+      return REAL;
+    default:
+      return REAL;//Error!
+    }
+
+  }
+
+  LpGlpk::SolveExitStatus MipGlpk::_solve() {
+    int result = LEMON_lpx(simplex)(lp);
+
+    // hack: mip does not contain integer variable
+#if GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION == 16
+    int tmp = -1;
+    if (LEMON_glp(get_num_int(lp)) == 0) {
+      tmp = LEMON_lpx(add_cols)(lp, 1);
+      LEMON_glp(set_col_bnds)(lp, tmp, LEMON_GLP(FX), 0.0, 0.0);
+      LEMON_glp(set_col_kind)(lp, tmp, LEMON_GLP(IV));
+    }
+#endif
+
+    if (LEMON_lpx(get_status)(lp)==LEMON_LPX(OPT)) {
+      //Maybe we could try the routine lpx_intopt(lp), a revised
+      //version of lpx_integer
+
+      result = LEMON_lpx(integer)(lp);
+      switch (result){
+      case LEMON_LPX(E_OK):
+        solved = true;
+        break;
+      default:
+        solved = false;
+      }
+    } else {
+      solved = false;
+    }
+#if GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION == 16
+    if (tmp != -1) {
+      int tmpa[2];
+      tmpa[1] = tmp;
+      LEMON_lpx(del_cols)(lp, 1, tmpa);
+    }
+#endif
+    return solved ? SOLVED : UNSOLVED;
+  }
+
+
+  LpGlpk::SolutionStatus MipGlpk::_getMipStatus() const {
+
+    if (LEMON_lpx(get_status)(lp)==LEMON_LPX(OPT)){
+      //Meg kell nezni: ha az LP is infinite, akkor ez is, ha az is
+      //infeasible, akkor ez is, de ez lehet maskepp is infeasible.
+      int stat= LEMON_lpx(mip_status)(lp);
+
+      switch (stat) {
+      case LEMON_LPX(I_UNDEF)://Undefined (no solve has been run yet)
+        return UNDEFINED;
+      case LEMON_LPX(I_NOFEAS)://There is no feasible integral solution
+        return INFEASIBLE;
+        //     case LEMON_LPX(UNBND)://Unbounded
+        //       return INFINITE;
+      case LEMON_LPX(I_FEAS)://Feasible
+        return FEASIBLE;
+      case LEMON_LPX(I_OPT)://Feasible
+        return OPTIMAL;
+      default:
+        return UNDEFINED; //to avoid gcc warning
+      //FIXME error
+      }
+    }
+    else
+      return UNDEFINED; //Maybe we could refine this: what does the LP
+                        //relaxation look like
+
+  }
+
+  MipGlpk::Value MipGlpk::_getPrimal(int i) const {
+    return LEMON_glp(mip_col_val)(lp,i);
+  }
+
+  MipGlpk::Value MipGlpk::_getPrimalValue() const {
+    return LEMON_glp(mip_obj_val)(lp);
+  }
+} //END OF NAMESPACE LEMON