Thank you for putting so much time into this.
I did some more tests with simulators and I think that libXISF isn't the primary issue. The simulators immediately crash and the logfiles don't mention libXISF.


Buuuut the error I stumbled upon with the latest build has been fixed by now so I was able to build the lastest version tonight. I didn't have much time to tinker around with it yet but simulators are working without crashes so far.
In this very moment I attached my guiding cam to the Pi and the driver works as well.

It's not 100% wanted but it seems to be a working setup. I hope that I get to test my usual workflow this weekend to see if it's stable enough for me and if so, I'll keep this build.

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