The 12.52 SP1 Webagent upgrade guide states that the following packages are required on RedHat 5 to upgrade Apache webagent:
Red Hat 5.x:
Can you please confirm if we need the exact package libstdc++-4.x.x-x.el5.i686.rpm on RedHat 5 as there are no i686.rpm files in REDHAT 5.x?
Webagent 12.52 SP1 on RedHat 5
It can also be i386 rpm.
All you need is the RPM for libstdc++ and it could be libstdc++-4.1.2-50.el5 listed in RPM output.