Was just checking on this library. On the GitHub repository, there is a link to his home page. On the home page, which is at http://homepage.hispeed.ch/peterfleury/avr-software.html#libs there is an announcement in several languages which includes the following:
The "My Homepage" service was discontinued on 30.11.2019. The data can still be copied via FTP until 31.03.2020.
The repository is at https://github.com/alx741/avr_i2c
A question: I was considering porting this to Mega0 chips. What would be the "protocol"? Should I ask Peter? Or, is it sufficient to acknowledge in headers? Any other courtesy details to resolve?