diff -r cc75c76972ee -r c0432d11811c src/gui/widgets/qabstractbutton.cpp
--- a/src/gui/widgets/qabstractbutton.cpp	Wed Apr 21 12:15:23 2010 +0300
+++ b/src/gui/widgets/qabstractbutton.cpp	Wed Apr 21 20:15:53 2010 +0300
@@ -57,7 +57,7 @@
 #define AUTO_REPEAT_DELAY  300
 #define AUTO_REPEAT_INTERVAL 100
 
-extern bool qt_tab_all_widgets;
+Q_GUI_EXPORT extern bool qt_tab_all_widgets;
 
 /*!
     \class QAbstractButton