Please install the prerequisted packages with the use of yast.

All perl modules (except the packages provided in this package) are on the distribution cd's/dvd of SuSE 9.0.

You still have to create the database and edit the following config files:

/data/WebGUI/etc/webgui.conf
/data/WebGUI/sbin/index.pl
/data/WebGUI/sbin/preload.perl
/etc/apache2/vhost.d/vhosts.conf

according the installation instructions of WebGUI.
(See http://www.plainblack.com/installation)

because these are the first RPM's which i have build and are working wel on my system, let me know if it's not on your system.