qmk-dactyl-manuform-a/keyboards/lfkeyboards/mini1800/post_rules.mk

ifeq ($(LFK_REV), A)
    MCU = at90usb1286
else
    MCU = at90usb646
endif

ifeq ($(strip $(ISSI_ENABLE)), yes)
    # TMK_COMMON_DEFS += -DISSI_ENABLE
endif