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);
);'>
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<tr><td><span title='2017-10-10 18:38:02 +0200'>2017-10-10</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=1066696dcc912e64edc6a2b0da5daa76e151c8f0'>gnu: lftp: Update to 4.8.3.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-09-29 21:51:51 +0200'>2017-09-29</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=16818c4856b8fe0b57054b60d5c33ede7fe6e8b5'>gnu: libfilezilla: Update to 0.11.0.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-09-27 21:02:56 +0200'>2017-09-27</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=2b2c24ed42c53ed4b2b904c0af27291852d3b059'>gnu: lftp: Update to 4.8.2.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-09-17 17:14:13 +0200'>2017-09-17</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=f2cc1b31365190fc97dc64e0fb6ca5a8b7cad217'>gnu: lftp: Update to 4.8.1.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-09-04 00:10:59 -0400'>2017-09-04</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=d10092b849153dc27cfed0a9601fde6c7bdec918'>gnu: Put autoconf-related phases immediately after the 'unpack phase.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-08-27 16:04:31 -0400'>2017-08-27</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=01f248b606dadf3a3950e06bc4a6305cfb3e452e'>gnu: filezilla: Update to 3.27.1.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-08-27 16:04:30 -0400'>2017-08-27</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=a9af060e5ddcc4e467db8a229334db7f0372a308'>gnu: libfilezilla: Update to 0.10.1.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-08-05 14:07:42 +0200'>2017-08-05</span></td><td><a href='/guix/commit/gnu/packages/ftp.scm?id=eedcfa704e650e203ecd8b4c448a5e69340cbfdf'>gnu: lftp: Update to 4.7.8.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>