arch/x86_64/kernel/acpi/Makefile - maze/linux - Git at Google

 obj-y			:= boot.o
 boot-y			:= ../../../i386/kernel/acpi/boot.o
 obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup.o

 ifneq ($(CONFIG_ACPI_PROCESSOR),)
 obj-y			+= processor.o
 endif
	obj-y := boot.o
	boot-y := ../../../i386/kernel/acpi/boot.o
	obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup.o

	ifneq ($(CONFIG_ACPI_PROCESSOR),)
	obj-y += processor.o
	endif