I am reluctant to go straight to the source at CA for an answer so I thought I'd try here first. I am trying to install client agents for CA Arcserve Backup 12.5 on a variety of Linux machines. The first one in question is a RHEL5 Server. When running the installer, I get the following message,

"The components you selected require this library file: libstdc++-libc6.1-1.so.2. Typically, Linux comes with this library file. It is located in the /usr/lib path.
Before you rerun the installation, install the following package:

compat-libstdc++

(y) to continue, (q) to quit :"

Searching for that library, it appears that there are many versions of it for different distros. Looking on some common sites that host RPMs, they all list tons of distros for RHEL but I do not even know what I am running to choose the correct one.

Any ideas?

Well, since you're paying both CA and RedHat for support, I'd certainly not be reluctant to ask them a question. Since you're using RedHat enterprise, you can get the correct version from RedHat.

The easiest thing would be to call RedHat support, and tell them what you're missing. They can either tell you a command to enter to get it installed, or give you a link to their website where you can get it.