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);
mit();'>
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<tr><td><span title='2020-09-08 09:17:51 +0300'>2020-09-08</span></td><td><a href='/guix/commit/gnu/packages/gnupg.scm?id=c9a6c0c6724ef5188bb31b7ff3496798bd955707'>gnu: pinentry: Enable curses fallback.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnupg.scm (pinentry-gtk2, pinentry-gnome3, pinentry-qt,
pinentry-efl)[arguments]: Add configure-flag for fallback curses mode.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-09-03 19:22:57 +0200'>2020-09-03</span></td><td><a href='/guix/commit/gnu/packages/gnupg.scm?id=edb994d3a85c0eaae3bd0d50aa575bcbbefe7c61'>gnu: gnupg: Update to 2.2.23 [security fixes].</a><span class='msg-avail'>...<span class='msg-tooltip'>No CVE assigned yet.  See &lt;https://dev.gnupg.org/T5050&gt;.

* gnu/packages/gnupg.scm (gnupg): Update to 2.2.23.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-08-28 14:11:33 +0300'>2020-08-28</span></td><td><a href='/guix/commit/gnu/packages/gnupg.scm?id=19fd7dc3a60aa08605cf85b2acae7764682bc8d8'>gnu: gnupg: Update to 2.2.22.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnupg.scm (gnupg): Update to 2.2.22.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-08-28 00:13:42 -0400'>2020-08-28</span></td><td><a href='/guix/commit/gnu/packages/gnupg.scm?id=e9a442b7651ab20bdfe7e0180f9fe91c5dae1521'>gnu: gpgme: Update to 1.14.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnupg.scm (gpgme): Update to 1.14.0.
[arguments]: Remove field, which included only a 'disable-failing-test' phase
that is no longer needed.
</span></span></td><td>Mark H Weaver</td></tr>