Originally Posted by bio71
Does anybody know if KDE 3.5 can be compiled with qt4?
No. In fact, a big part of the kde4 development process has been invested porting everything to qt4. You can't even compile it against qt3support without some patching.
Has anyone had any luck compiling KDE 4.1.1?
Obviously lots of people, otherwise it wouldn't exist. I use Gentoo and the kde-testing overlay simplifies the whole process a lot, but as long as you have all the relevant stuff there, it should build.
However, note that kdepim has been introduced in 4.1 (it was not there in 4.0), so expect bugs at all levels. I have only installed kmail and it compiled fine, but it segfaults every now and then.