anchor.diff:  , ninja
   , fetchurl
   , pkg-config
  -, gtk3
  +, gtk4
   , glib
   , gdk-pixbuf
   , desktop-file-utils
  
positive.code: , wrapGAppsHook
  , python3
  , gnome
  , libhandy
  , librsvg
  , rustc
  , cargo
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gnome-tour";
    version = "42.beta";
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.major version}/${pname}-${version}.tar.xz";
      hash = "sha256-c8NnZvWcqnnYXKuooveqaize81fBT6JZHgXck7Fbx+I=";
    };
  
    cargoVendorDir = "vendor";
  