anchor.diff:    ++ lib.optionals stdenv.isDarwin [ libiconv ];
   
     nativeBuildInputs = [
  +    installShellFiles
       meson
       ninja
       pkg-config
       sphinx
     ];
   
  +  postInstall = ''
  +    installShellCompletion --cmd mpc --bash $out/share/doc/mpc/contrib/mpc-completion.bash
  +  '';
  +
  +  postFixup = ''
  +    rm $out/share/doc/mpc/contrib/mpc-completion.bash
  +  '';
  +
     meta = with lib; {
       homepage = "https://www.musicpd.org/clients/mpc/";
       description = "A minimalist command line interface to MPD";
  -    license = licenses.gpl2;
  +    changelog = "https://raw.githubusercontent.com/MusicPlayerDaemon/mpc/v${version}/NEWS";
  +    license = licenses.gpl2Plus;
       maintainers = with maintainers; [ AndersonTorres ];
       platforms = with platforms; unix;
     };
  
positive.code: 
    src = fetchFromGitHub {
      owner = "MusicPlayerDaemon";
      repo = "mpc";
      rev = "v${version}";
      hash = "sha256-2FjYBfak0IjibuU+CNQ0y9Ei8hTZhynS/BK2DNerhVw=";
    };
  
negative.code: { lib
  , stdenv
  , fetchFromGitHub
  , installShellFiles
  , libiconv
  , libmpdclient
  , meson
  