{
  description = "UL Wolves API Library";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    naersk.url = "github:nix-community/naersk";
    utils.url = "github:numtide/flake-utils";
  };

  nixConfig = {
    extra-substituters = "https://nix-cache.skynet.ie/skynet-cache";
    extra-trusted-public-keys = "skynet-cache:zMFLzcRZPhUpjXUy8SF8Cf7KGAZwo98SKrzeXvdWABo=";
  };

  outputs = {
    self,
    nixpkgs,
    utils,
    naersk,
  }:
    utils.lib.eachDefaultSystem (
      system: let
        pkgs = (import nixpkgs) {inherit system;};
        naersk' = pkgs.callPackage naersk {};
        package_name = "wolves_api";
        buildInputs = with pkgs; [
          openssl
          pkg-config
          rustfmt
        ];
      in rec {
        packages = {
          # For `nix build` & `nix run`:
          default = naersk'.buildPackage {
            pname = "${package_name}";
            src = ./.;
            buildInputs = buildInputs;
          };
          # Run `nix build .#fmt` to run tests
          fmt = naersk'.buildPackage {
            src = ./.;
            mode = "fmt";
            buildInputs = buildInputs;
          };
          # Run `nix build .#clippy` to lint code
          clippy = naersk'.buildPackage {
            src = ./.;
            mode = "clippy";
            buildInputs = buildInputs;
          };
          test = naersk'.buildPackage {
            src = ./.;
            mode = "test";
            buildInputs = buildInputs;
          };
        };

        # `nix develop`
        devShell = pkgs.mkShell {
          nativeBuildInputs = (
              with pkgs; [rustc cargo]
            ) ++ buildInputs;
        };
      }
    );
}