[kiloreux]

So the real versions here is in the `import <nixpkgs> {};` You need to pin it to a specific version or even commit from nixpkgs github repo. So instead of that, you can find the commit that has all your desired versions and pin it that way. with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/9a5f7b1630c138a82cb...) {};

This way, all your versions of packages will be pinned to this specific revision, and you can also use multiple revisions at the same time.

[topspin]

What is this 'pint' term? I thought it was a typo of 'pin' but you used it twice.

[kiloreux]

It was just a typo twice. Sorry for the confusion.