anchor.diff:  { stdenv
  -, fetchFromGitHub
  -, fetchpatch
  +, fetchFromGitHub 
   , pantheon
   , pkgconfig
   , meson
  
positive.code:     wingpanel
    ];
  
    patches = [
      # Add support for libecal-2.0
      (fetchpatch {
        url = "https://github.com/elementary/wingpanel-indicator-datetime/commit/3ccd05d611e6dd5274a03f061ba1b5e13d6fe0cf.patch";
        sha256 = "011q9b4pjmk4fpq5zscl5r8m4n3jiyx464023h4j7zf8r1070jz6";
      })
    ];
  
    postPatch = ''
      chmod +x meson/post_install.py
      patchShebangs meson/post_install.py
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "wingpanel-indicator-datetime";
    version = "2.2.2";
  
    src = fetchFromGitHub {
      owner = "elementary";
      repo = pname;
      rev = version;
      sha256 = "0a0pqrpmrdd5pch30lizr9righlc7165z7krmnaxrzd0fvfkbr2h";
    };
  
    passthru = {
  