2.5.11 SMP, APIC, build breaks

[blitzkrieg]

HI,
I was trying to compile 2.5.11, I noticed that if 
# CONFIG_SMP is not set

	and
	
# CONFIG_X86_LOCAL_APIC is not set
# CONFIG_X86_IO_APIC is not set

the build breaks with the following errors

arch/i386/kernel/kernel.o: In function `intel_thermal_interrupt':
arch/i386/kernel/kernel.o(.text+0x7271): undefined reference to `ack_APIC_irq'
arch/i386/kernel/kernel.o: In function `intel_init_thermal':
arch/i386/kernel/kernel.o(.text.init+0x2ad2): undefined reference to `apic_read'
arch/i386/kernel/kernel.o(.text.init+0x2b12): undefined reference to `apic_write_around'
arch/i386/kernel/kernel.o(.text.init+0x2b31): undefined reference to `apic_read'
arch/i386/kernel/kernel.o(.text.init+0x2b41): undefined reference to `apic_write_around'
make: *** [vmlinux] Error 1

moreover, all works fine if

CONFIG_SMP= y

	or 
	
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y

I have a single processor machine (Celeron (Mendocino)) and, yes, I
did 'make mrproper'

bye bye
-b

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