diff --git a/lemon/glpk.h b/lemon/glpk.h
--- a/lemon/glpk.h
+++ b/lemon/glpk.h
@@ -2,7 +2,7 @@
  *
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) 2003-2008
+ * Copyright (C) 2003-2010
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
  *
@@ -30,7 +30,7 @@
   namespace _solver_bits {
     class VoidPtr {
     private:
-      void *_ptr;      
+      void *_ptr;
     public:
       VoidPtr() : _ptr(0) {}
 
@@ -38,8 +38,8 @@
       VoidPtr(T* ptr) : _ptr(reinterpret_cast<void*>(ptr)) {}
 
       template <typename T>
-      VoidPtr& operator=(T* ptr) { 
-        _ptr = reinterpret_cast<void*>(ptr); 
+      VoidPtr& operator=(T* ptr) {
+        _ptr = reinterpret_cast<void*>(ptr);
         return *this;
       }
 
@@ -65,6 +65,7 @@
 
     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);
@@ -123,13 +124,13 @@
         freeEnv();
       }
     };
-    
+
     static FreeEnvHelper freeEnvHelper;
 
   protected:
-    
+
     int _message_level;
-    
+
   public:
 
     ///Pointer to the underlying GLPK data structure.