fix build failure

src/Gui/Widgets.cpp

@@ -23,6 +23,7 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
+# include <QAction>
 # include <QColorDialog>
 # include <QDesktopWidget>
 # include <QDialogButtonBox>

src/Gui/Widgets.h

@@ -33,6 +33,7 @@
 #include <QPlainTextEdit>
 #include <QBasicTimer>
 #include <QTime>
+#include <QToolButton>
 
 namespace Gui {
 class PrefCheckBox;