AH_TEMPLATE([CONFIG_HAVE_FENCE], [Defined when on a system that has memory fence
instructions.])
AH_TEMPLATE([CONFIG_HAVE_FUTEX], [Defined when on a system with futex support.])
AH_TEMPLATE([CONFIG_HAVE_FENCE], [Defined when on a system that has memory fence
instructions.])
AH_TEMPLATE([CONFIG_HAVE_FUTEX], [Defined when on a system with futex support.])