anchor.diff:      mv docs/html $doc/share/doc/libsidplayfp/
     '';
   
  +  passthru = {
  +    updateScript = nix-update-script {
  +      attrPath = pname;
  +    };
  +  };
  +
     meta = with lib; {
       description = "A library to play Commodore 64 music derived from libsidplay2";
       longDescription = ''
  
positive.code: { stdenv
  , lib
  , fetchFromGitHub
  , fetchpatch
  , autoreconfHook
  , pkg-config
  , perl
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "libsidplayfp";
    version = "2.2.0";
  
    src = fetchFromGitHub {
      owner = "libsidplayfp";
      repo = "libsidplayfp";
      rev = "v${version}";
      fetchSubmodules = true;
      sha256 = "sha256-lDM4nJozZF8Rt+XWnM41hBAYatZVsmvvQajgHLI9uy0=";
    };
  
    postPatch = ''
      patchShebangs .
  