seeing as RHEL5 is not free and you MUST buy a license and support contract
Have you asked red hat about your network card ?
normally there is NO NEED to build a "driver"
https://www.redhat.com/support/
also for a "driver" you will need to do more than just
Code:
./configure && make
su
make install
you will need a bunch of code to built that
most should be installed from
Code:
su -
yum groupinstall "Development Tools" "Development Libraries"
yum install kernel-devel