if(CONFIG_ZMK_RGB_EFFECT_LAYER)
  target_sources(app PRIVATE src/rgb_underglow_layer.c)
  target_sources(app PRIVATE src/effects/layer_effect.c)
  target_sources(app PRIVATE src/behaviors/behavior_underglow_color.c)
  target_sources(app PRIVATE src/behaviors/behavior_underglow_battery.c)
  target_sources(app PRIVATE src/behaviors/behavior_underglow_indicators.c)
  target_sources(app PRIVATE src/events/underglow_color_changed.c)
  target_include_directories(app PRIVATE include)
endif()