Today with kdevelop write code, compile time display can't find the Qt version do not match, so I install Qt4. *, or not after installation is finished, then I uninstalled, result the same instruction, just change the install to remove, he gave me the kdevelop to uninstall, then, I install kdevelop, finally use the install -f command, according to connection, suggested I use autoremove, the results give uninstalled, I what all,,, All blame I didn't understand the purpose of the instructions before use instructions, I thought that prompted instruction, should the question is not very big, with directly, as a result,,,, is heavy,,,,