WebbotLib AVR library
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atmega168.h

This is the system file you should include as a matter of last resort if you are developing for the ATMega168 but your actual board is not listed in the sys folder. ie it is for a generic 168 board. This may also be because you have created your own ATMega168 based board. Consequently the library assumes that all processor pins have header pins.
It wll make sure that your compiler settings sre appropriate: ie ATMega168

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