RHEL 5 SEP Client Installation

While installing the SEP 12.1.5 client on RHEL 5.10, I run into a missing library issue. Specifically, the libX11 and libgcc libraries, which are not available in i686 architecture from RedHat. These packages are installed in x86_64 and i386. I have not been able to find a way to install these libraries, since they are not available from RedHat for RHEL 5.

Has anyone else tried to install 12.1.5 on RHEL5? If so, how did you get around this issue?

Thanks!