Error building kernel

cc -c -O -pipe  -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -W
missing-prototypes -Wpointer-arith -Winline -Wcast-qual  -fformat-extensions -st
d=c99 -g -nostdinc -I-  -I. -I/home2/src/sys -I/home2/src/sys/contrib/dev/acpica
 -I/home2/src/sys/contrib/altq -I/home2/src/sys/contrib/ipfilter -I/home2/src/sy
s/contrib/pf -I/home2/src/sys/contrib/dev/ath -I/home2/src/sys/contrib/dev/ath/f
reebsd -I/home2/src/sys/contrib/ngatm -D_KERNEL -include opt_global.h -fno-commo
n -finline-limit=8000 --param inline-unit-growth=100 --param large-function-grow
th=1000  -fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone  -mfpmath=387 -mn
o-sse -mno-sse2 -mno-mmx -mno-3dnow  -msoft-float -fno-asynchronous-unwind-table
s -ffreestanding   /home2/src/sys/amd64/amd64/mem.c
/home2/src/sys/amd64/amd64/mem.c: In function `memrw':
/home2/src/sys/amd64/amd64/mem.c:96: warning: implicit declaration of function `
PHYS_TO_DMAP'
/home2/src/sys/amd64/amd64/mem.c:96: warning: nested extern declaration of `PHYS
_TO_DMAP'
/home2/src/sys/amd64/amd64/mem.c:96: warning: cast to pointer from integer of di
fferent size
/home2/src/sys/amd64/amd64/mem.c:102: error: `DMAP_MIN_ADDRESS' undeclared (firs
t use in this function)
/home2/src/sys/amd64/amd64/mem.c:102: error: (Each undeclared identifier is repo
rted only once
/home2/src/sys/amd64/amd64/mem.c:102: error: for each function it appears in.)
/home2/src/sys/amd64/amd64/mem.c:102: error: `DMAP_MAX_ADDRESS' undeclared (firs
t use in this function)
/home2/src/sys/amd64/amd64/mem.c:103: warning: implicit declaration of function
`DMAP_TO_PHYS'
/home2/src/sys/amd64/amd64/mem.c:103: warning: nested extern declaration of `DMA
P_TO_PHYS'
/home2/src/sys/amd64/amd64/mem.c:117: error: `KERNBASE' undeclared (first use in
 this function)
*** Error code 1

I have defined
    device    mem
    device    null

in my config. Compilation is on an amd64 system.

--WjW