Ok, I tested this when I was home for lunch, and as Nuno Sucena said, this works also: LD_PRELOAD=/usr/lib/libqt-gl.so.2 varicad /usr/lib/libqt-gl.so.2 is a symbolic link to /usr/lib/libqt-gl.so.2.3.1 which was the file that I copied around and renamed. Tomas Nykung