Some relevant things: Nim already expects global Nimble packages in `/opt/nimble/pkgs` ([https://github.com/nim-lang/Nim/blob/devel/config/nim.cfg#L49](https://github.com/nim-lang/Nim/blob/devel/config/nim.cfg#L49))
This issue has a lot of relevant discussion [https://github.com/nim-lang/nimble/issues/80](https://github.com/nim-lang/nimble/issues/80)
