--- zzzz-none-000/linux-4.19.183/drivers/isdn/Kconfig	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/drivers/isdn/Kconfig	2023-06-28 08:54:19.000000000 +0000
@@ -58,6 +58,8 @@
 
 if ISDN_CAPI
 
+source "drivers/isdn/capi_oslib/Kconfig"
+
 source "drivers/isdn/capi/Kconfig"
 
 source "drivers/isdn/hardware/Kconfig"