acpid: can't open /proc/acpi/event: No such file or directory

Hi
I'm trying to set up ACPI, on my gentoo system, so that I can use the power button to hibernate the system. I compiled the kernel (2.6.23) with the folowing ACPI options:

# Power management options (ACPI, APM)
CONFIG_ACPI=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_PROCFS=y
CONFIG_ACPI_PROC_EVENT=y
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_FAN=y
# CONFIG_ACPI_DOCK is not set
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_HOTPLUG_CPU=y
CONFIG_ACPI_THERMAL=y
# CONFIG_ACPI_ASUS is not set
# CONFIG_ACPI_TOSHIBA is not set
CONFIG_ACPI_BLACKLIST_YEAR=0
CONFIG_ACPI_DEBUG=y
# CONFIG_ACPI_DEBUG_FUNC_TRACE is not set
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_SYSTEM=y
CONFIG_ACPI_CONTAINER=y
# CONFIG_ACPI_SBS is not set
CONFIG_PNPACPI=y
# CONFIG_THINKPAD_ACPI is not set
CONFIG_BLK_DEV_IDEACPI=y
CONFIG_ATA_ACPI=y

I've emerged ACPI and ACPID.
Now, when I boot into this kernel and try to start ACPID, I get this:

ellen linux # /etc/init.d/acpid start
* Service acpid starting
acpid: can't open /proc/acpi/event: No such file or directory

      [ !! ]

* ERROR: acpid failed to start

Any ideas? I thought the CONFIG_ACPI_PROC_EVENT=y option would fix this.

I don't know much about ACPI, but the dmesg gives a lot of output on acpi during boot, and there seems to be no error in that, so I think acpi is activated like it should. I can post that output too if it helps.

thanks for any help
/Johan