I\'m running Kubuntu 11.10 (w/ KDE 4.8)
Before you read all this :
I just want to remove all traces of OpenCV from my system, so I can start afresh..
If opencv is installed using sudo make install command on source then go to the build folder and use sudo make uninstall and it should uninstall opencv
sudo make install
sudo make uninstall
You can do a sudo make uninstall for a clean uninstall