--- zzzz-none-000/linux-4.4.60/drivers/isdn/hardware/avm/Kconfig	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/drivers/isdn/hardware/avm/Kconfig	2018-11-08 13:36:17.000000000 +0000
@@ -61,4 +61,5 @@
 	  Enable support for the AVM C4/C2 PCI cards.
 	  These cards handle 4/2 BRI ISDN lines (8/4 channels).
 
+source "drivers/isdn/isdn_fon5/Kconfig"
 endif # CAPI_AVM