anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "sidplayfp";
  -  version = "2.1.1";
  +  version = "2.2.0";
   
     src = fetchFromGitHub {
       owner = "libsidplayfp";
       repo = "sidplayfp";
       rev = "v${version}";
  -    sha256 = "0s3xmg3yzfqbsnlh2y46w7b5jim5zq7mshs6hx03q8wdr75cvwh4";
  +    sha256 = "sha256-hN7225lhuYyo4wPDiiEc9FaPg90pZ13mLw93V8tb/P0=";
     };
   
     nativeBuildInputs = [ autoreconfHook perl pkg-config ];
  
positive.code: 
    enableParallelBuilding = true;
  
    meta = with lib; {
      description = "A SID player using libsidplayfp";
      homepage = "https://github.com/libsidplayfp/sidplayfp";
  
negative.code: { stdenv
  , lib
  , fetchFromGitHub
  , nix-update-script
  , autoreconfHook
  , perl
  , pkg-config
  