compat-libstdc++ missing for RHEL for z/Linux

I have a old library that requires libstdc++.so.5

I tried to install it with

yum install compat-libstdc++
Loaded plugins: product-id, search-disabled-repos, subscription-manager
rhel-7-for-system-z-eus-rpms | 3.5 kB 00:00:00

rhel-7-for-system-z-rpms | 3.5 kB 00:00:00

No package compat-libstdc++ available.
Error: Nothing to do

Is is available?