anchor.diff:    pname = "elementary-greeter";
     version = "6.0.1";
   
  -  repoName = "greeter";
  -
     src = fetchFromGitHub {
       owner = "elementary";
  -    repo = repoName;
  +    repo = "greeter";
       rev = version;
       sha256 = "1f606ds56sp1c58q8dblfpaq9pwwkqw9i4gkwksw45m2xkwlbflq";
     };
  
positive.code:     clutter-gtk # else we get could not generate cargs for mutter-clutter-2
      elementary-gtk-theme
      elementary-icon-theme
      elementary-settings-daemon
      gnome-settings-daemon
      gdk-pixbuf
      granite
  
negative.code: , elementary-icon-theme
  , wingpanel-with-indicators
  , elementary-gtk-theme
  , nixos-artwork
  , lightdm
  , gdk-pixbuf
  