kdevelop dependecy problem on debian

I just tried to get starting with kdevelop. Somehow I cannot get the development files installed: # apt-get install libqt3-mt-dev libqt3-mt Reading package lists... Done Building dependency tree Reading state information... Done libqt3-mt is already the newest version. libqt3-mt set to manually installed. Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libqt3-mt-dev : Depends: libqt3-mt (= 3:3.3.8d-1ubuntu0+ax1~squeeze) but 3:3.3.8-d-0ubuntu0+sr73+pr181~squeeze is to be installed E: Unable to correct problems, you have held broken packages. Any idea how to correct that? Nik