qmk_firmware/keyboards/subatomic/rules.mk

# MCU name
MCU = at90usb1286

# Bootloader selection
BOOTLOADER = atmel-dfu

# Build Options
#   change to "no" to disable the options, or define them in the Makefile in 
#   the appropriate keymap folder that will get included automatically
#
BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
MOUSEKEY_ENABLE = no       # Mouse keys
EXTRAKEY_ENABLE = yes       # Audio control and System control
CONSOLE_ENABLE = no         # Console for debug
COMMAND_ENABLE = no        # Commands for debug and configuration
NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
MIDI_ENABLE = yes           # MIDI support
AUDIO_ENABLE = no           # Audio output 
UNICODE_ENABLE = no         # Unicode
RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.

# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend