I am installing a simulator called groovenet: GrooveNet Vehicular Network Simulator :: University of Pennsylvania & Carnegie Mellon. which works with opensuse 10 and qt3. Since opensuse 10 is no more available, I tried to install it on opensuse 1. The problem is that only compiles with qt3. Now, I have both qt3 and qt4 on my opensuse. But I have to remove qt4. Can somebody explain to me, How I can uninstall qt4?