diff -r 994c7df296c9 -r 1b89e29c9fc7 lemon/lp_skeleton.cc
--- a/lemon/lp_skeleton.cc	Thu Dec 10 17:05:35 2009 +0100
+++ b/lemon/lp_skeleton.cc	Thu Dec 10 17:18:25 2009 +0100
@@ -32,6 +32,11 @@
     return ++row_num;
   }
 
+  int SkeletonSolverBase::_addRow(Value, ExprIterator, ExprIterator, Value)
+  {
+    return ++row_num;
+  }
+
   void SkeletonSolverBase::_eraseCol(int) {}
   void SkeletonSolverBase::_eraseRow(int) {}