Index: src/gui/RRulerQt.cpp
--- src/gui/RRulerQt.cpp.orig
+++ src/gui/RRulerQt.cpp
@@ -25,6 +25,7 @@
 #include "RMdiChildQt.h"
 
 #include <QPainter>
+#include <QPainterPath>
 
 /**
  * Constructor
