2.4.19-pre7-ac2 ACPI compile failure

ar rcs lib.a checksum.o old-checksum.o delay.o usercopy.o getuser.o memcpy.o strstr.o iodebug.o make[2]: Leaving directory `/usr/src/linux/arch/i386/lib'
make[1]: Leaving directory `/usr/src/linux/arch/i386/lib'

ld -m elf_i386 -T /usr/src/linux/arch/i386/vmlinux.lds -e stext arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/main.o init/version.o init/do_mounts.o \
        --start-group \
        arch/i386/kernel/kernel.o arch/i386/mm/mm.o kernel/kernel.o 
mm/mm.o fs/fs.o ipc/ipc.o \
         drivers/acpi/acpi.o drivers/parport/driver.o 
drivers/char/char.o drivers/block/block.o drivers/misc/misc.o drivers/net/net.o drivers/media/media.o drivers/char/agp/agp.o drivers/char/drm/drm.o drivers/ide/idedriver.o drivers/cdrom/driver.o drivers/sound/sounddrivers.o drivers/pci/driver.o drivers/pcmcia/pcmcia.o drivers/net/pcmcia/pcmcia_net.o drivers/pnp/pnp.o drivers/video/video.o drivers/usb/usbdrv.o drivers/input/inputdrv.o drivers/message/i2o/i2o.o drivers/hotplug/vmlinux-obj.o \
        net/network.o \
        /usr/src/linux/arch/i386/lib/lib.a /usr/src/linux/lib/lib.a 
/usr/src/linux/arch/i386/lib/lib.a \
        --end-group \

drivers/acpi/acpi.o: In function `sm_osl_proc_write_sleep':
drivers/acpi/acpi.o(.text+0x2bba1): undefined reference to `software_suspend'
make: *** [vmlinux] Error 1

Regards

Sid Boyce ... hamradio G3VBV ... Cessna/Warrior Pilot
Linux only shop

I got the same failure.
Addig CONFIG_SOFTWARE_SUSPEND = y seems to work.