1-2 weeks ago I started seeing the following warnings on every `guix
package' invocation:

--8<---------------cut here---------------start------------->8---
Warning: Schema ?org.gnome.system.locale? has path ?/system/locale/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
Warning: Schema ?org.gnome.system.proxy? has path ?/system/proxy/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
Warning: Schema ?org.gnome.system.proxy.http? has path ?/system/proxy/http/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
Warning: Schema ?org.gnome.system.proxy.https? has path ?/system/proxy/https/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
Warning: Schema ?org.gnome.system.proxy.ftp? has path ?/system/proxy/ftp/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
Warning: Schema ?org.gnome.system.proxy.socks? has path ?/system/proxy/socks/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
--8<---------------cut here---------------end--------------->8---

Any idea where that could come from?

-- 
Pierre Neidhardt