ifeq ($(LFK_REV), A) MCU = at90usb1286else MCU = at90usb646endif ifeq ($(strip $(ISSI_ENABLE)), yes) OPT_DEFS += -DISSI_ENABLEendif ifeq ($(strip $(WATCHDOG_ENABLE)), yes) OPT_DEFS += -DWATCHDOG_ENABLEendif