Kernel config dependency error?

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

I'm building a kernel which does not have any audio devices included, 
except for sysbeep and midi (both attaching at pcppi).

I'm getting the following undefined symbol references to audio_cd :

audio.o: In function `audio_enter':
/build/netbsd-local/src/sys/dev/audio.c:1188: undefined reference to 
`audio_cd'
audio.o: In function `audiopoll':
/build/netbsd-local/src/sys/dev/audio.c:1441: undefined reference to 
`audio_cd'
audio.o: In function `audiokqfilter':
/build/netbsd-local/src/sys/dev/audio.c:1474: undefined reference to 
`audio_cd'


It seems that no struct cf_driver is generated for audio_cd in the 
generated ioconf.c


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