Update:

>>> I thought 2.8 wasn't going to support Powerbooks.

>> Yes, as far as I'm aware that didn't change.

> Or did it?
> http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=32432&forum=41#616764

Apparently, it did:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7960&forum=3&start=12