anchor.diff:    src = fetchurl {
       url = "https://github.com/sddm/sddm/releases/download/v${version}/sddm-${version}.tar.xz";
       hashOutput = false;  # https://github.com/sddm/sddm/releases
  -    sha256 = "e9138a23e7f0846f7dcb925964d301f1a597fae2047b373d7dbe4cd5340f8e3b";
  +    sha256 = "13ec3e04ecdb0ab83a6ae62c734fdf86f86c1851a90b06f85f5bf8776fcb0632";
     };
   
     nativeBuildInputs = [
  
positive.code: }:
  
  let
    version = "0.16.0";
  in
  stdenv.mkDerivation {
    name = "sddm-${version}";
  
negative.code:     systemd-dummy
      xorg.libxcb
    ];
  
    preConfigure = ''
      touch "$TMPDIR/login.defs"
  