../../libraries/AP_InertialSensor/AP_InertialSensor_config.h:20:2: error: #error "INS_AUX_INSTANCES must be zero if INS_MAX_INSTANCES is less than 3" 20 | #error "INS_AUX_INSTANCES must be zero if INS_MAX_INSTANCES is less than 3" | ^~~~~
where the files were identical and the board an obvious derivative, grab the defaults.parm from the other place.