diff -ru qjackctl-0.4.0/src/qjackctlPatchbayRack.h qjackctl-0.4.0-zx2c4/src/qjackctlPatchbayRack.h
--- qjackctl-0.4.0/src/qjackctlPatchbayRack.h	2015-07-15 15:30:36.801752820 +0200
+++ qjackctl-0.4.0-zx2c4/src/qjackctlPatchbayRack.h	2015-08-28 10:53:45.711811995 +0200
@@ -24,6 +24,7 @@
 
 #include "qjackctlAbout.h"
 
+#include <QObject>
 #include <QStringList>
 
 #include <jack/jack.h>