{
  lib,
  stdenv,
  fetchFromGitHub,
  rustPlatform,
  libiconv,
  darwin,
  zlib,
}: let
  rev = "v13.0.0-alpha.8";
in
  rustPlatform.buildRustPackage {
    pname = "tokei";
    version = rev;

    src = fetchFromGitHub {
      owner = "XAMPPRocky";
      repo = "tokei";
      inherit rev;
      hash = "sha256-jCI9VM3y76RI65E5UGuAPuPkDRTMyi+ydx64JWHcGfE=";
    };

    cargoHash = "sha256-XvRO5AbPYZVRVxqFmKf2Xn4K9VvZyb3eyJLu/cGrPdI=";

    patches = [
      ./skel.patch
      ./why3.patch
    ];

    buildInputs = lib.optionals stdenv.isDarwin [
      libiconv
      darwin.Security
    ];

    checkInputs = lib.optionals stdenv.isDarwin [zlib];

    # enable all output formats
    buildFeatures = ["all"];
  }