Qt 3.2 will probably show you a long list of dependencies. Having most up-to-date system helps here (if your profile is correct, RH 9 may not have all the newest packages). Upgrade to Qt 3.2 (and KDE 3.2 or 3.3) is a good idea, but it takes time.
If you have problems with Qt installation, you may consider compiling Qt and KDE from source (instructions on KDE website). It's rather long process (2-3 days, depening on the machine used), but you get a fresh version compiled for your machine (what means: faster). If you have time, do it.
If you don't...well. If I remember correctly in KDevelop 2.1 you have to edit makefiles yourself. With automake/autoconf it may be a hard task. Using the orginal makefiles may be a better solution.