Conditional built modules in dkms.conf

[JDarnley]

Similar to #392 I am looking for a conditional listing of files in dkms.conf but in contrast to that (I think) I want it to be based on a kernel config option. In my case I specifically want CONFIG_AUXILIARY_BUS.

I make a package using "dkms mkdeb" so I need it to be checked when apt tries to make dkms install it much later and elsewhere for every kernel that dkms tried to install for.

Is there an approved way to query this at "build" time?