Installing xgl/compiz requires the needed packages to be installed, after which your X configuration needs to be changed (if the packages installed don't automatically overwrite your X config), after which you need to restart your X. I myself wanted to have the regular X and the xgl-one both so I could switch between them, and had to create a small script for changing a symlink so I could start either of them.
xgl is also buggy software, that's sure. And it will remain so for a while, so I don't recommend installing it if your 3d graphics card isn't a good one; I've tried xgl with a couple of cards and it seems it's hell if the 3d gfx card is somehow bad (not enough memory = annoying, a buggy driver+card combination = lots of crashes etc.)
Try to search the install guide for Ubuntu; there you'll find information about which packages you need to have and are presented with two scripts that help starting/stopping xgl and compiz. They surely don't work right-out-of-the-box for you as you use SuSE, but you get the idea and can pretty surely do the rest yourself.
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