qmk_firmware/keyboards/elephant42/rules.mk

# Build Options
#   change yes to no to disable
#
BOOTMAGIC_ENABLE = yes      # 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            # Enable N-Key Rollover
BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
RGB_MATRIX_ENABLE = yes
RGB_MATRIX_DRIVER = WS2812
AUDIO_ENABLE = no           # Audio output
SPLIT_KEYBOARD = yes
OLED_ENABLE = yes
LTO_ENABLE = yes