build fails No module named 'yaml'

[hemna]

I cloned the repo, then did a build, and it fails.

git clone https://github.com/lvgl-micropython/lvgl_micropython
cd lvgl_micropython
python3 make.py esp32 clean --flash-size=4 --enable-jtag-repl=y BOARD=ESP32_GENERIC_C6 DISPLAY=st7789

...

-- Build files have been written to: /Users/I530566/devel/mine/esp32/lvgl_micropython/lib/micropython/ports/esp32/build-ESP32_GENERIC_C6/submodules
Generating build files....
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/display/display_driver_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/display/rgb_display_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/touch_calibration/touch_cal_data.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/touch_calibration/touch_calibrate.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/_indev_base.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/button_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/encoder_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/keypad_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/indev/pointer_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/fs_driver.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/py_api_drivers/frozen/io_expander/io_expander_framework.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/common_api_drivers/frozen/other/i2c.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/common_api_drivers/frozen/other/task_handler.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/common_api_drivers/display/st7789/_st7789_init.py
/Users/I530566/devel/mine/esp32/lvgl_micropython/api_drivers/common_api_drivers/display/st7789/st7789.py
Compiling....
Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
No module named 'yaml'
This usually means that "idf.py" was not spawned within an ESP-IDF shell environment or the python virtual environment used by "idf.py" is corrupted.
Please use idf.py only in an ESP-IDF shell environment. If problem persists, please try to install ESP-IDF tools again as described in the Get Started guide.
make: *** [all] Error 1

[kdschlosser]

remove the "clean" from the build command