I didn't got the cube effect.

There are lots of dependencies to be installed in slackware before I can test compiz and make it work.

I have a guide to install in ubuntu/fedora and its so simple in those distributions.

Installing Beryl Or Compiz Fusion On A Fedora 7 Desktop | HowtoForge - Linux Howtos and Tutorials

There is guide for ubuntu in this site as well.

They even modify xorg.conf on their own.

But at the end I will settle with slackware