On Ubuntu 22.04 it's even easier. Just add Jasem's PPA and do an "apt install". It all just works.

The PPA features ARM builds, and they've worked seamlessly on my RPi4 for a few years now. I don't seem to be missing anything by running Ubuntu rather than Raspberry Pi OS, and it behaves just like any Ubuntu system.

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It appears they've "borrowed" the FITS conversion code from Siril. They may be doing something else on top of that for star removal.

However, since Siril is GPLed, that means that ZWO component and anything it links to needs to be GPLed (and the source code for all released versions provided).

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