Please note that I cannot follow every new thread created so I miss these DC threads requesting help. If you would like assistance, please post to the main DC thread.
http://talk.maemo.org/showthread.php?t=29347

Most likely DC will be your only Qt application at the moment. To verify, run the following
(I think)

That will ask to remove everything that depends on that package. Look at the list, say no, and use HAM to uninstall all of the top level applications