You can however define inputs that are not the whole of nixpkgs. You would use something like this and you would pin it to a very exact version and hash of a pa

You can however define inputs that are not the whole of nixpkgs. You would use something like this and you would pin it to a very exact version and hash of a package: https://nixos.org/guides/nix-pills/nixpkgs-overriding-packages.html https://nixos.org/guides/nix-pills/nixpkgs-overriding-packag...