Setting environment variable

[Bob Huisman]

I am currently writing a kickstart script that must install a base
system and some custom packages. Each of those packages has 2
'versions', a fully automated one and one that just deploys the
software. Which version to deploy is determined by an environment
variable read in the .spec file.

I have been thinking about making a package which sets some of the
environment variables, and have that installed too, but I understood
that the order of installation of packages is not always the same...

As the system has just been installed, there are no pre-set environment
variables which can be used. I was wondering whether and how it is
possible to set an environment variable before installation of any
custom packages?

I am using RHEL 5 with RHN Satellite 5 beta. Anyone who has a suggestion
on how to deal with this problem?

Thanks in advance!

Bob