enabling ACPI

I want to test the new acpi_thermal and I'm using something like that

BEOS_ADD_ONS_DRIVERS_ACPI = $(X86_ONLY)acpi_button $(X86_ONLY)acpi_thermal ;

in HaikuImage file, but at boot I get error messages like Search for
drivers/power/acpi_thermal/driver_v1 failed and something about the
api_version not setted.

Is this procedure correct?

Regards,
Francesco Piccinno

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