nano与pro mini 都有328 和 168 两种，makefile如何写呢？我编译时

make -k
Arduino-boards: Can't find nano.build.mcu
make: "/usr/local/arduino-bsd-mk/scripts/arduino-boards -f /usr/local/arduino/hardware/arduino/avr/boards.txt nano build.mcu" returned non-zero status


我也试过在 boards.txt 里缺什么加什么，但我猜应该有更方便的方法吧？请教。

我的makefile

ARDUINO_DIR= /usr/local/arduino
ARDUINO_MK_DIR= /usr/local/arduino-bsd-mk
ARDUINO_LIBS= SPI Wire Adafruit_GFX Adafruit_SH1106 Adafruit_BusIO
AVRDUDE_PORT= /dev/cuaU0
ARDUINO_BOARD= nano
TARGET= eWatch

include ${‌‌ARDUINO_MK_DIR}/bsd.arduino.mk