But if you are using the CVS version, you should not start SuSE's startkde but the one of the CVS version.
So you need to set $WINDOWMANAGER to that new startkde
export WINDOWMANAGER=/your_new_path_to_the_installed_kde_cvs/bin/startkde
As for /etc/ld.so.conf, try first to run it without any change. KDE uses absolute library path, so such a change is not really needed (at least when it works correctly.)
Have a nice day!