I forgot to say that we're using Debian, I just followed the instructions at www.openacs.org and http://www.togaware.com/linux/survivor/Oracle_10g.shtml(for debian), I also set all the environment variables, just as in de documentation, and I don't remember getting so many warnings.
I'm sorry I can't help you more. Ypu could try searching for RHEL specific documentation (http://www.puschitz.com/InstallingOracle10g.shtml maybe?).
Good luck! =)