The new version of compiz in the git repos requires xcb, something that ubuntu doesn't have. You will need to do this: http://forum.compiz-fusion.org/showpost.php?p=22332&postcount=4 if you are running ubuntu.
These instructions are only valid if you are compiling compiz from git with the old get-git script or with fyda's OLD instructions. Her instructions now work without this fix.
Those using repositories will NOT need to follow these instructions.