On Thu, 26 Jul 2007 01:55:03 +0000 "Dave Young" [off-list ref] wrote:

Hi,
drivers/built-in.o(.text+0xc649): In function `acpi_pci_choose_state':
: undefined reference to `acpi_pm_device_sleep_state'
drivers/built-in.o(.text+0x3fe08): In function `pnpacpi_suspend':
: undefined reference to `acpi_pm_device_sleep_state'
make: *** [.tmp_vmlinux1] Error 1

The pci-acpi.c depends on CONFIG_ACPI_SLEEP

There's a hopeful-fix for this in 
ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc1/2.6.23-rc1-mm1/hot-fixes/

(will be readable in a few minutes - I had to chmod it)