The biggest hitch you'll encounter when installing ICD 7.6 on Redhat Linux in a dev/test environment is the error
CTGIN8264E : Hostname failure : System hostname is not fully qualified
And the reason it's a big hitch is because the error is misleading. You do need to have your hostname set to your FQDN, but you also need to have an actual DNS (not just /etc/hosts, but true DNS) A record for your hostname. If you don't already have one that you can update, you can install the package named:
The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) server
It is available on the base Redhat install DVD.