I think you mean 3.2 not 2.3?
Was it QT you wanted to upgrade?
I tried to do this in order to get the latest kde, but Mandrake 9.0 would not have it, and I really tried everything.
In fact this was the last straw that made me move to slackware, as I was fed up with upgrading Mandrake and rpms.
My guess is that you will need to move up to mdk9.1 or later to achieve what you want, (someone else here may know better)
good luck, tobyl