diff -r 56cd8111b7f7 -r 41300fa6a67c src/gui/util/qsystemtrayicon_p.h
--- a/src/gui/util/qsystemtrayicon_p.h	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/gui/util/qsystemtrayicon_p.h	Tue Feb 02 00:43:10 2010 +0200
@@ -94,6 +94,7 @@
 
 class QBalloonTip : public QWidget
 {
+    Q_OBJECT
 public:
     static void showBalloon(QSystemTrayIcon::MessageIcon icon, const QString& title,
                             const QString& msg, QSystemTrayIcon *trayIcon,