ld -m elf_i386 -T
/usr/src/linux-2.4.20-rc1-ac4+fs199+acpi20021101/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/char/char.o drivers/block/block.o
drivers/misc/misc.o drivers/net/net.o drivers/media/media.o
drivers/ide/idedriver.o drivers/cdrom/driver.o drivers/pci/driver.o
drivers/net/pcmcia/pcmcia_net.o drivers/net/wireless/wireless_net.o
drivers/video/video.o drivers/md/mddev.o \
        net/network.o \
        /usr/src/linux-2.4.20-rc1-ac4+fs199+acpi20021101/arch/i386/lib/lib.a
/usr/src/linux-2.4.20-rc1-ac4+fs199+acpi20021101/lib/lib.a
/usr/src/linux-2.4.20-rc1-ac4+fs199+acpi20021101/arch/i386/lib/lib.a \
        --end-group \
        -o vmlinux
arch/i386/kernel/kernel.o: In function 	`io_apic_set_pci_routing':
arch/i386/kernel/kernel.o(.text+0x12b7b): undefined reference to
`target_cpus'
make: *** [vmlinux] Error 1


This one-liner fixes it:

--- arch/i386/kernel/io_apic.c~	Sun Nov 17 16:02:29 2002
+++ arch/i386/kernel/io_apic.c	Sun Nov 17 16:02:29 2002
@@ -1894,7 +1894,7 @@
 
 	entry.delivery_mode = dest_LowestPrio;
 	entry.dest_mode = INT_DELIVERY_MODE;
-	entry.dest.logical.logical_dest = target_cpus();
+	entry.dest.logical.logical_dest = TARGET_CPUS;
 	entry.mask = 1;					 /* Disabled (masked) */
 	entry.trigger = 1;				   /* Level sensitive */
 	entry.polarity = 1;					/* Low active */