Using esp_efuse_mac_get_default() in IDE 2.X to get ESP8266/ESP32 MAC address

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What do I need to install to be able to use esp_mac.h ?

might be obvious, but i quite don't understand what download from esp-idf-2.0/components/esp32/include/esp_system.h at master · pycom/esp-idf-2.0 · GitHub