I installed it on Red Hat 6.1. If you follow the install directions at
http://www.openacs.org/doc/acspg/html/concrete-acs.html, you should be able to get it working with no problems. I also had to refer to the other documents at
http://www.openacs.org/doc/acspg/index.html. It's much easier to install OpenACS with postgreSQL than it is to install ACS with Oracle. I'm still trying to get Oracle, AOLServer and ACS to talk to each other. =)
Gilbert Wong