anchor.diff:        owner = "xiph";
         repo = "rav1e";
         rev = "v${version}";
  -      sha256 = "09w4476x6bdmh9pv4lchrzvfvbjvxxraa9f4dlbwgli89lcg9fcf";
  +      sha256 = "0jnq5a3fv6fzzbmprzfxidlcwwgblkwwm0135cfw741wjv7f7h6r";
       };
   
       cargoLock = fetchurl {
         url = "https://github.com/xiph/rav1e/releases/download/v${version}/Cargo.lock";
  -      sha256 = "0rkyi010z6qmwdpvzlzyrrhs8na929g11lszhbqx5y0gh3y5nyik";
  +      sha256 = "14fi9wam9rs5206rvcd2f3sjpzq41pnfml14w74wn2ws3gpi46zn";
       };
   
       installPhase = ''
  
positive.code:     '';
    };
  
    cargoSha256 = "1iza2cws28hd4a3q90mc90l8ql4bsgapdznfr6bl65cjam43i5sg";
    nativeBuildInputs = [ nasm cargo-c ];
  
    postBuild = ''
  
negative.code: 
  rustPlatform.buildRustPackage rec {
    pname = "rav1e";
    version = "0.4.1";
  
    src = stdenv.mkDerivation rec {
      name = "${pname}-${version}-source";
  