Deriving a minimum application from spi_lcd_touch_example

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CYD ESP-WROOM-32
Build an application that write some lines, points, test a slider, display some text.
I got the spi-lcd-touch example working (can build it, flash and run it on the target under Vscode/ESP-32)

Parallel to the project I created a new project, which contains the following main.c:

#include "../lv_examples.h"
#if LV_BUILD_EXAMPLES && LV_USE_SLIDER

static lv_obj_t * label;

static void slider_event_cb(lv_event_t * e)
{
    lv_obj_t * slider = lv_event_get_target(e);

    /*Refresh the text*/
    lv_label_set_text_fmt(label, "%"LV_PRId32, lv_slider_get_value(slider));
    lv_obj_align_to(label, slider, LV_ALIGN_OUT_TOP_MID, 0, -15);    /*Align top of the slider*/
}

/**
 * Create a slider and write its value on a label.
 */
void lv_example_get_started_4(void)
{
    /*Create a slider in the center of the display*/
    lv_obj_t * slider = lv_slider_create(lv_screen_active());
    lv_obj_set_width(slider, 200);                          /*Set the width*/
    lv_obj_center(slider);                                  /*Align to the center of the parent (screen)*/
    lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_VALUE_CHANGED, NULL);     /*Assign an event function*/

    /*Create a label above the slider*/
    label = lv_label_create(lv_screen_active());
    lv_label_set_text(label, "0");
    lv_obj_align_to(label, slider, LV_ALIGN_OUT_TOP_MID, 0, -15);    /*Align top of the slider*/
}

#endif

When I build the project, app_main is missing. Also I don’t know how to put lvl_examples.h into an includes directory rather than into the toplevel.

I’m not sure whether I have the right components in managed_components. The example spi_lcd_touch demo seems to refer a lot of freertos stuff.