anchor.diff:      '';
     };
   
  -  cargoSha256 = "1i5ldqb77rrhfxxf9krp7f6yj3h6rsqak6hf23fd2znhgmi7psb1";
  +  cargoSha256 = "1iza2cws28hd4a3q90mc90l8ql4bsgapdznfr6bl65cjam43i5sg";
     nativeBuildInputs = [ nasm cargo-c ];
   
     postBuild = ''
  
positive.code: 
  rustPlatform.buildRustPackage rec {
    pname = "rav1e";
    version = "0.4.0-alpha";
  
    src = stdenv.mkDerivation rec {
      name = "${pname}-${version}-source";
  
negative.code:       owner = "xiph";
        repo = "rav1e";
        rev = "v${version}";
        sha256 = "09w4476x6bdmh9pv4lchrzvfvbjvxxraa9f4dlbwgli89lcg9fcf";
      };
  
      cargoLock = fetchurl {
        url = "https://github.com/xiph/rav1e/releases/download/v${version}/Cargo.lock";
        sha256 = "0rkyi010z6qmwdpvzlzyrrhs8na929g11lszhbqx5y0gh3y5nyik";
      };
  
      installPhase = ''
  