To build it you need to set up your toolchain as described here: https://docs.espressif.com/projects/esp-idf/en/latest/get-started/get-started-devkitc.html https://docs.espressif.com/projects/esp-idf/en/latest/get-started/windows-setup.html
Using Eclipse to build: https://docs.espressif.com/projects/esp-idf/en/latest/get-started/eclipse-setup.html