ardupilot/libraries/AP_ExternalAHRS/AP_ExternalAHRS_config.h

#pragma once

#include <AP_HAL/AP_HAL_Boards.h>

#ifndef HAL_EXTERNAL_AHRS_ENABLED
#define HAL_EXTERNAL_AHRS_ENABLED !HAL_MINIMIZE_FEATURES && !defined(HAL_BUILD_AP_PERIPH) && BOARD_FLASH_SIZE > 1024
#endif