uart module breaks buildkernel

===> uart
_at_ -> /usr/src/sys
machine -> /usr/src/sys/i386/include
awk -f _at_/tools/makeobjops.awk _at_/dev/uart/uart_if.m -c
awk -f _at_/tools/makeobjops.awk _at_/kern/bus_if.m -h
awk -f _at_/tools/makeobjops.awk _at_/kern/device_if.m -h
awk -f _at_/tools/makeobjops.awk _at_/isa/isa_if.m -h
awk -f _at_/tools/makeobjops.awk _at_/dev/pci/pci_if.m -h
awk -f _at_/tools/makeobjops.awk _at_/dev/uart/uart_if.m -h
rm -f .depend
mkdep -f .depend -a   -nostdinc -D_KERNEL -DKLD_MODULE -I- -I. -I_at_ -I_at_/../include -I/usr/obj/usr/src/i386/usr/include  /usr/src/sys/modules/uart/../../dev/uart/uart_bus_acpi.c /usr/src/sys/modules/uart/../../dev/uart/uart_bus_ebus.c /usr/src/sys/modules/uart/../../dev/uart/uart_bus_isa.c /usr/src/sys/modules/uart/../../dev/uart/uart_bus_pci.c /usr/src/sys/modules/uart/../../dev/uart/uart_bus_puc.c /usr/src/sys/modules/uart/../../dev/uart/uart_core.c /usr/src/sys/modules/uart/../../dev/uart/uart_cpu_i386.c /usr/src/sys/modules/uart/../../dev/uart/uart_dev_i8251.c /usr/src/sys/modules/uart/../../dev/uart/uart_dev_ns8250.c /usr/src/sys/modules/uart/../../dev/uart/uart_dev_sab82532.c /usr/src/sys/modules/uart/../../dev/uart/uart_dev_z8530.c uart_if.c /usr/src/sys/modules/uart/../../dev/uart/uart_tty.c
/usr/src/sys/dev/uart/uart_bus_ebus.c:39:34: sparc64/ebus/ebusvar.h: No such file or directory
mkdep: compile failed
*** Error code 1

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

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

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

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


Caveat sys/sparc64 doesn't exist on this system because
it isn't a sparc64 platform and it has limited disk space.

-- 
Steve