libstdc++.so.5 (the 32-bit x86 version [aka i686 in nix] and not the x64 64-bit version) is required in order to run MOHAA servers on any flavor of Linux, but to install it on the latest version of Red Hat / CentOS / Rocky Linux, you'll need to follow this guide.

Red Hat says libstdc++.so.5 is too old:

https://access.redhat.com/discussions/5973261

But thanks to this article by IBM (https://www.ibm.com/support/pages/node/6117862), here is a working solution:

Code:
sudo -i
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/compat-libstdc++-33-3.2.3-72.el7.i686.rpm
yum localinstall compat-libstdc++-33-3.2.3-72.el7.i686.rpm
If that file ever disappears from the internet as is typical these days, here's my own mirror for it:

Code:
sudo -i
wget http://dinofly.com/files/linux/compat-libstdc++-33-3.2.3-72.el7.i686.rpm
yum localinstall compat-libstdc++-33-3.2.3-72.el7.i686.rpm