libc claims to supports megaAVR 0-Series Devices: ATmega808, ATmega809, ATmega1608, ATmega1609, ATmega3208, ATmega3209, ATmega4808, ATmega4809 Will there be an update? https://avrdudes.github.io/avr-libc/avr-libc-user-manual-2.3.0/index.html