anchor.diff:    xonotic-data = fetchzip {
       name = "xonotic-data";
       url = "https://dl.xonotic.org/xonotic-${version}.zip";
  -    sha256 = "15caj11v9hhr7w55w3rs1rspblzr9lg1crqivbn9pyyq0rif8cpl";
  +    sha256 = "sha256-/malKGbDdUnqG+bJOJ2f3zHb7hAGiNZdprczr2Fgb5E=";
       postFetch = ''
         cd $out
         rm -rf $(ls | grep -v "^data$" | grep -v "^key_0.d0pk$")
  
positive.code: 
  let
    pname = "xonotic";
    version = "0.8.2";
    name = "${pname}-${version}";
    variant =
      if withSDL && withGLX then
  
negative.code: 
      src = fetchurl {
        url = "https://dl.xonotic.org/xonotic-${version}-source.zip";
        sha256 = "sha256-oagbpVqxUb8JdY5/WWFLLlFQ6EIkdT53lQvNB6KC6l0=";
      };
  
      nativeBuildInputs = [ unzip ];
      buildInputs = [ libjpeg zlib libvorbis curl gmp ]
  