bug#40834: system-config-printer fails while starting

[Michael Rohleder]

this seems to fix it:

>From 83e8f11687b284bbda73c482434fac0bc0f8f9bf Mon Sep 17 00:00:00 2001
From: Michael Rohleder <mike@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 <monego@posteo.net>
 ;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
 ;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
+;;; Copyright © 2020 Michael Rohleder <mike@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