On 1.99.3, I get this on a full build.
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
-fno-strength-reduce -pipe -m486 -DCPU=486 -DMODULE -c -o ddp.o ddp.c
ddp.c: In function `atif_ioctl':
ddp.c:833: `KERN_WARING' undeclared (first use this function)
ddp.c:833: (Each undeclared identifier is reported only once
ddp.c:833: for each function it appears in.)
ddp.c:833: parse error before string constant
make[2]: *** [ddp.o] Error 1
make[2]: Leaving directory `/usr/src/linux/net/appletalk'
-- Peter
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