I have got a torrent smac.iso-file and just started as root "sh setup.sh". After installation procedure I startet as a user and got the discussed X Server error message. Then I added the composite disabling lines in the xorg.conf, according to the hints in this thread. After a reboot it works fine. Thanks to the community!
I really love this game, so I am very happy that this game is surviving in Linux. In Windows XP there is no chance to get this game started.