Hello
i try to use the QTouchevent to do a pinchzoom on a simple application. (With an touch screen)

In order to understand how does it work i take the sample mouse code :
http://doc.qt.io/qt-4.8/qt-touch-pinchzoom-example.html

But i have two differents results... If i compile my program with :
qmake
make
./mouse

the pinch zoom is working fine.
In the second case, if i compile my program with :

/usr/local/TrollTech/QT4.8.6/bin/qmake
make
./mouse

the pinch zoom doesn't works !
Does anyone can explain to me what is the difference between the use of the native system qmake and the specific Trolltech qmake ?

Thanks you in advance, and sorry for my bad english.