anchor.diff:      gtk3
       libchamplain
       libgee
  +    libhandy
       libical
       libnotify
       libgdata # required by some dependency transitively
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "elementary-calendar";
    version = "5.1.1";
  
    repoName = "calendar";
  
  
negative.code: , gtk3
  , granite
  , libgee
  , libhandy
  , geoclue2
  , libchamplain
  , clutter
  