The setuid helper of D-Bus is responsible for "service activation".
It looks for '.service' files in fixed locations, but the default locations
make no sense (see below), so replace them with /etc/dbus-1/system-services.

--- dbus-1.10.0/dbus/dbus-sysdeps-util-unix.c	2015-10-22 00:07:03.829251854 +0200
+++ dbus-1.10.0/dbus/dbus-sysdeps-util-unix.c	2015-10-22 00:07:14.893445175 +0200
@@ -1410,10 +1410,7 @@ _dbus_get_standard_system_servicedirs (D
    * be available.
    */
   static const char standard_search_path[] =
-    "/usr/local/share:"
-    "/usr/share:"
-    DBUS_DATADIR ":"
-    "/lib";
+    "/etc";
   DBusString servicedir_path;
 
   _dbus_string_init_const (&servicedir_path, standard_search_path);
t();'>
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<tr><td><span title='2022-11-06 00:08:04 -0400'>2022-11-06</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=451d2802f6471d1a5f2eea08ae7ce2ad8747f797'>gnu: fmt: Update to 9.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (fmt): Update to 9.1.0.
(fmt-8): New variable.
* gnu/packages/hyperledger.scm (hyperledger-iroha)
[snippet]: Delete trailing  #t.
[native-inputs]: Re-indent.  Replace fmt with fmt-8.
* gnu/packages/networking.scm (opendht) [inputs]: Replace fmt with fmt-8.
* gnu/packages/storage.scm (ceph): Likewise.
* gnu/packages/video.scm (mkvtoolnix): Likewise.
* gnu/packages/aidc.scm (zxing-cpp): Likewise.
* gnu/packages/wm.scm (waybar): Likewise.
* gnu/packages/geo.scm (osm2pgsql): Likewise.
* gnu/packages/graphics.scm (openimageio): Likewise.
* gnu/packages/build-tools.scm (bear): Likewise.
* gnu/packages/networking.scm (restinio): Likewise.
</span></span></td><td>Maxim Cournoyer</td></tr>