I've run into some similar problems with RHAS 3... some settings Ora Support has had me try are:

environment:
LD_ASSUME_KERNEL=2.4.19

file stuff:
create a link for g++ and gcc to ver 2.96 versions instead of the 3.x versions

After doing these, I've had some success, however some things still do not work like I would expect.

Happy to help more if I can, but I think we are both on the bleeding edge with Redhat/Oracle on this one...

JoeB