Let me start out by saying I read the man pages for this command over and over and tried and tried.

I'm trying to build drivers for my ethernet device. I guess -bb no longer works as an option with rpm in Redhat 9 (due to legacy issues) so I'm trying to install rpmbuild so I can build the driver binaries for my device.

But everytime I type in:

install librpmbuild-4.2.so

My return is: too few arguements (or 'options' - I forget) see man pages for 'install'

So what option or arguement do I need to do in order to install rpmbuild?

Thanks in advance.

Try something like:
# rpm -ivh /location/to/rpms/rpm-build-*