Qt: http://pepper.troll.no/s60prereleases/snapshots/qt-symbian-opensource-4.6.0-snapshot-20091111.exe
Device: N95

#include <QtGui>

int main(int argc, char **argv) {
    QApplication app(argc, argv);
    QLabel label("mongo");
    label.showMaximized();
    return app.exec();
}

How to build/reproduce:

qmake -project
qmake
make debug-winscw
make run

results:

C:\temp\testing31again>make run
call /S60/devices/S60_3rd_FP1/epoc32\release\winscw\udeb\testing31again.exe
C:\S60\devices\S60_3rd_FP1\epoc32\tools\make.exe: [run] Error 23 (ignored)

Note: works on the phone (N95)