Kernel compile R7.0 i386 GENERIC, fails

[Peter B]

I'm trying to compile the generic FreeBSD kernel 7.0-RELEASE i386. But it
fails. Any tip on how to fix it?

Extracted sources: sbase, srelease, ssys

toor at m /usr/src #make buildkernel KERNCONF=GENERIC
.
.
mkdep -f .depend -a   -nostdinc -D_KERNEL -DKLD_MODULE -DHAVE_KERNEL_OPTION_HEADERS -I. -I@ -I@/contrib/altq -I/usr/obj/usr/src/sys/GENERIC /usr/src/sys/modules/accf_http/../../netinet/accf_http.c
===> acpi (depend)
===> acpi/acpi (depend)
@ -> /usr/src/sys
machine -> /usr/src/sys/i386/include
make: don't know how to make dsfield.c. Stop
*** Error code 2

Stop in /usr/src/sys/modules/acpi.
*** Error code 1

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

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

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

Stop in /usr/src.
Exit 1