You can obtain the latest version of KDE su from my ftp area at ftp://skynet.stack.nl/pub/users/geertj/
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KDE su is also in the KDE CVS, module kdenonbeta. This version is, however, a bit outdated. It is recommended that you use the ftp version until I update the CVS.
KDE su uses the autoconf scripts from the KDE SDK to configure, compile and install. Installation is as easy as:
$ ./configure $ make $ make install
You will have to execute the last step as root. The installation process needs to be able to write to the system wide KDE directories.