{ SweepChart_chart = lv_chart_create( guider_ui.screen, NULL ); } run simulator, compile fails as it can't find lv_chart_create() edit ./lvgl-simulator/lv_conf.h change #define LV_USE_CHART 0 to #define LV_USE_CHART 1 run simulator, compile fails again refresh lv_conf.h. Defi...