anchor.diff:  
   rustPlatform.buildRustPackage rec {
     pname = "rav1e";
  -  version = "0.4.0";
  +  version = "0.4.1";
   
     src = stdenv.mkDerivation rec {
       name = "${pname}-${version}-source";
  
positive.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 = ''
  
negative.code:     '';
    };
  
    cargoSha256 = "1j92prjyr86wyx58h10xq9c9z28ky86h291x65w7qrxpj658aiz1";
    nativeBuildInputs = [ nasm cargo-c ];
  
    postBuild = ''
  