Kernel build error

[GeekGod]

Greetings!

I've been running into a small problem building a kernel this morning.
After removing /usr/obj, building world and then trying the kernel build
again, I get this error:

rm -f hack.c
sh /usr/src/sys/conf/newvers.sh DUAL
cc -c -O -pipe  -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -fformat-extens
ions -ansi -g -nostdinc -I. -I/usr/src/sys -I/usr/src/sys/../include -I/usr/
src/sys/contrib/dev/acpica -I/usr/src/sys/contrib/ipfilter  -D_KERNEL -inclu
de opt_global.h  -mpreferred-stack-boundary=2 -fno-common -ffreestanding
vers.c
linking kernel.debug
ugen.o: In function `ugen_do_read':
/usr/src/sys/dev/usbmisc/ugen/ugen.c:647: undefined reference to
`getugenbuf'
/usr/src/sys/dev/usbmisc/ugen/ugen.c:762: undefined reference to
`relugenbuf'
ugen.o: In function `ugen_do_write':
/usr/src/sys/dev/usbmisc/ugen/ugen.c:814: undefined reference to
`getugenbuf'
/usr/src/sys/dev/usbmisc/ugen/ugen.c:872: undefined reference to
`relugenbuf'
*** Error code 1

Stop in /usr/obj/usr/src/sys/DUAL.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

Any ideas?

Thanks,
GG