snapper-gui: ValueError: Namespace Gtk not available

pkgs/applications/misc/snapper-gui/default.nix

···
     sha256 = "13j4spbi9pxg69zifzai8ifk4207sn0vwh6vjqryi0snd5sylh7h";
   };
 
-  nativeBuildInputs = [ wrapGAppsHook ];
+  nativeBuildInputs = [ wrapGAppsHook gobject-introspection ];
 
   buildInputs = [
     python3
-    gobject-introspection
     gnome.adwaita-icon-theme
   ];