{fetchgit}:
fetchgit {
  url = "https://github.com/mautrix/whatsapp";
  rev = "f0401ee81e2e71262498d4e34e25c141b5b92acd";
  sha256 = "0k9qhfd6h3br1l6yqm1ps7gvrfz84xxdw6x8y3h9wvbmc3ym2g6y";
  leaveDotGit = true;
}