installation on RedHat 6.2

Could you please tell me the least error prone way to install the latest
possible version of PostgreSQL on Linux 6.2? I have no choice but to use
6.2. I already have MySql installed and working and now I want to compare
PostgreSQL. I am told it is much better, the documentation certainly bears
that out, but the rpm packages for RedHat 7.1 do not install properly. I
would really appreciate any help you can give!
Thanks,
Rob