add missing header file

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@22304 a592a061-630c-0410-9148-cb99ea01b6c8

diff --git a/src/frontends/qt4/GuiWorkArea.cpp b/src/frontends/qt4/GuiWorkArea.cpp
index a5948e5d37e5c6b3d39c041d7c4eb2dca3544b52..fe83308bc77d02be451abefdf7860f196e1f23c3 100644 (file)
--- a/src/frontends/qt4/GuiWorkArea.cpp
+++ b/src/frontends/qt4/GuiWorkArea.cpp
@@ -56,6 +56,7 @@
 #include <QTabBar>
 #include <QTimer>
 #include <QToolButton>
+#include <QToolTip>
 
 #include <boost/bind.hpp>