Source: Ubuntu
https://launchpad.net/ubuntu/precise/+source/kdesvn/1.5.5-3ubuntu1

--- kdesvn-1.5.5.orig/src/svnfrontend/graphtree/revgraphview.h
+++ kdesvn-1.5.5/src/svnfrontend/graphtree/revgraphview.h
@@ -49,7 +49,7 @@ typedef svn::SharedPointer<KTemporaryFil
 /**
 	@author Rajko Albrecht <ral@alwins-world.de>
 */
-class RevGraphView : virtual public QGraphicsView
+class RevGraphView : public QGraphicsView
 {
     Q_OBJECT
 public: