It should end at the dev putting out some sort of communication stating they’re not responsible for packaging, and to reach out to the package maintainers with issues installing from a package and not from the officially documented/supported installation procedure. That isn’t out of the norm at all for the open source community, and is one of the main reasons for releasing source code - to enable other people to build it and try to get it to work in whatever environment they want to.

That shouldn’t require a change to a much more restrictive license, and it certainly shouldn’t require implementing changes to your code that force it to fail on specific OSes (like what was recently added for Arch).