In the Ruby wiki page users are told to set GEM_HOME in order to avoid inconsistencies between `gem` and `bundler` (and also the issue with a user `~/.gemrc`).

This is because the rubygems project has refused to fix the problem for more than 10 years (for the first report of many see https://github.com/rubygems/bundler/issues/710).

The Arch Linux task FS#68757 suggested to set GEM_HOME in /etc/profile.d, which is an easy and safe fix, but devolved into unnecessary personal attacks.

Another solution is to override `Gem.default_dir` by providing an operating_system.rb like Fedora does:

https://src.fedoraproject.org/rpms/rubygems/raw/rawhide/f/operating_system.rb

We don't need such an overly complicated code, I'm providing a simple version of operating_system.rb that fixes all the issues and works perfectly fine on my system.

With this there's no need for any /etc/gemrc.