tdlib: 1.8.27 -> 1.8.28

stdenv.mkDerivation {

  pname = "tdlib";

  version = "1.8.27";

  version = "1.8.28";

  src = fetchFromGitHub {

    owner = "tdlib";

    # The tdlib authors do not set tags for minor versions, but

    # external programs depending on tdlib constrain the minor

    # version, hence we set a specific commit with a known version.

    rev = "efc6bd553b61dea0ae8c0436695e8d2539bf03f9";

    hash = "sha256-AHfuT+bLkc8Lm1B96E/kwUx1ZKStQbv/skH8woRITRk=";

    rev = "38d31da77a72619cf7ec5d479338a48274cc7446";

    hash = "sha256-y6Gt8gDfvIBJd/2O4vTs38DzAPyL9pAZBbrf2qcv9cY=";

  };

  buildInputs = [ gperf openssl readline zlib ];