--- a/src/qtgui/rclmain.h
+++ b/src/qtgui/rclmain.h
@@ -68,7 +68,7 @@
     RclSortSpec sortspecs;
     DocSequence *docsource;
     std::map<int,int> pageParaToReldocnums;
-
+    RclDHistory *m_history;
 private:
     virtual void init();
     virtual bool eventFilter( QObject * target, QEvent * event );