anchor.diff:  { stdenv
   , lib
   , fetchFromGitHub
  -, fetchpatch
  +, nix-update-script
   , autoreconfHook
   , pkg-config
   , perl
  
positive.code:     mv docs/html $doc/share/doc/libsidplayfp/
    '';
  
    meta = with lib; {
      description = "A library to play Commodore 64 music derived from libsidplay2";
      longDescription = ''
  
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 .
  