Im very new to Linux, and enjoying it so far, Knoppix has sucsueded in puting in most things I need, except for a few things. So I like get DCGUI's RPM file, and I open it and click install and it brings this up, now I took a short look and I don't think Knoppix has a program called alien, so what do I do about this error?

<mnt/hdd1/dclib-0.2.21-1mdk.i586.rpm';echo RESULT=$?
rpm: To install rpm packages on Debian systems, use alien. See README.Debian.
error: cannot open Packages index using db3 - No such file or directory (2)
error: cannot open Packages database in /var/lib/rpm
RESULT=1

I didn't see anything about this in the documentation.