this seems to fix it:
>From 83e8f11687b284bbda73c482434fac0bc0f8f9bf Mon Sep 17 00:00:00 2001
From: Michael Rohleder <m...@rohleder.de>
Date: Fri, 31 Jul 2020 15:06:11 +0200
Subject: [PATCH] gnu: system-config-printer: fix for 40834.
* gnu/packages/gnome.scm (system-config-printer): fix 40834.
---
gnu/packages/gnome.scm | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 8f0153f6bf..017fa3647c 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -54,6 +54,7 @@
;;; Copyright © 2020 Vinicius Monego <mon...@posteo.net>
;;; Copyright © 2020 Brice Waegeneire <br...@waegenei.re>
;;; Copyright © 2020 Arun Isaac <arunis...@systemreboot.net>
+;;; Copyright © 2020 Michael Rohleder <m...@rohleder.de>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -1988,6 +1989,7 @@ database is translated at Transifex.")
("gobject-introspection" ,gobject-introspection)
("python" ,python)
("cups" ,cups)
+ ("gtk+" ,gtk+) ; fix http://issues.guix.gnu.org/40834
("python-dbus" ,python-dbus)
("python-pygobject" ,python-pygobject)
("python-pycups" ,python-pycups)
--
2.28.0
