anchor.diff:  , gnome-online-accounts
   , wrapGAppsHook
   , folks
  +, libgdata
   , libxml2
   , gnome3
   , vala
  
positive.code:     evolution-data-server
      gsettings-desktop-schemas
      folks
      gnome-desktop
      libhandy
      libxml2
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gnome-contacts";
    version = "40.0";
  
    src = fetchurl {
      url = "mirror://gnome/sources/gnome-contacts/${lib.versions.major version}/${pname}-${version}.tar.xz";
      sha256 = "0w2g5xhw65adzvwzakrj5kaim4sw1w7s8qqwm3nm6inq50znzpn9";
    };
  
    propagatedUserEnvPkgs = [
  