In the document I describe how you can install cleanly separated Ruby gems in $HOME using the Ruby gem command that comes with GNU Guix:
https://github.com/pjotrp/guix-notes/blob/master/RUBY#L152 It requires some manipulation of environment vars. A wrapper script may automate this. For Ruby developers this is the perfect setup, allowing clean and easy switching between different rubies and gems. System-level gem support will come later which will support gems that live in the store (each gem under its own store path). That will be incredible useful for deployment. Pj.
