gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2
-fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2
-malign-jumps=2 -malign-functions=2 -DCPU=586 -c -o soundcard.o
soundcard.c
soundcard.c: In function `sound_notifier_chain_register':
soundcard.c:1252: warning: implicit declaration of function
`notifier_chain_register'
soundcard.c:1259: dereferencing pointer to incomplete type
make[3]: *** [soundcard.o] Error 1
make[3]: Leaving directory `/usr/src/linux/drivers/sound'
make[2]: *** [first_rule] Error 2
make[2]: Leaving directory `/usr/src/linux/drivers/sound'
make[1]: *** [sub_dirs] Error 2
make[1]: Leaving directory `/usr/src/linux/drivers'
make: *** [linuxsubdirs] Error 2