xserver-xorg had dbus in it's dependencies, but didn't select it in kconfig.
@@ -10,6 +10,7 @@ config BR2_PACKAGE_XSERVER_XORG_SERVER
select BR2_PACKAGE_XPROTO_GLPROTO
select BR2_PACKAGE_XPROTO_KBPROTO
select BR2_PACKAGE_XPROTO_RANDRPROTO
+ select BR2_PACKAGE_DBUS
select BR2_PACKAGE_FREETYPE
select BR2_PACKAGE_XLIB_LIBX11
select BR2_PACKAGE_XLIB_LIBXAU
Peter Korsgaard