In the install section for linux, there should be a section for RHEL users to install openal-soft before using Classicube, otherwise audio won't work (curl is installed by default on RHEL, or at least Rocky Linux (that is the distribution i am using - please double-check)). An example would be a command like

$ sudo dnf install openal

or

$ sudo dnf install openal-soft

(Both will work)

I don't nesecarily think Rocky Linux is RHEL based after the whole thing to do with making source code to RHEL paid. It's more or so RHEL compatible, not RHEL based.

While that is true, neither curl nor openal is standard across linux, and some distros might have a different name for them, like Rocky Linux, and then they try to run 'sudo dnf install libopenal1' without realizing there's a different name for it. Just sayin'