diff --git a/lemon/clp.h b/lemon/clp.h
--- a/lemon/clp.h
+++ b/lemon/clp.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).
  *
@@ -75,6 +75,7 @@
 
     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);
@@ -137,7 +138,7 @@
     virtual void _clear();
 
     virtual void _messageLevel(MessageLevel);
-    
+
   public:
 
     ///Solves LP with primal simplex method.