$ nix store prefetch-file <url>
- get default.nix from nixpkgs master-repo
- run the command below
NIXPKGS_ALLOW_UNFREE=1 nix-build -E 'with import <nixpkgs> { }; callPackage ./default.nix { }'
find githubId: https://api.github.com/users/yourusername
$ nix-shell -p nixpkgs-lint --run nixpkgs-lint <yourpkg.nix>