--- zzzz-none-000/linux-4.4.60/drivers/isdn/hardware/avm/Kconfig	2017-04-08 07:53:53.000000000 +0000
+++ wasp-540e-714/linux-4.4.60/drivers/isdn/hardware/avm/Kconfig	2019-07-03 09:21:34.000000000 +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