anchor.diff:    meta = with lib; {
       description = "Sound Indicator for Wingpanel";
       homepage = "https://github.com/elementary/wingpanel-indicator-sound";
  -    license = licenses.gpl2Plus;
  +    license = licenses.gpl3Plus;
       platforms = platforms.linux;
       maintainers = pantheon.maintainers;
     };
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "wingpanel-indicator-sound";
    version = "2.1.6";
  
    src = fetchFromGitHub {
      owner = "elementary";
      repo = pname;
      rev = version;
      sha256 = "sha256-WGkxLsbdJ7Z7kolymYpggsVy4cN4CicNKdfCbunklSI=";
    };
  
    passthru = {
      updateScript = nix-update-script {
  
negative.code: { lib, stdenv
  , fetchFromGitHub
  , fetchpatch
  , nix-update-script
  , pantheon
  , pkg-config
  