FYI, I have updated my laptop to XCode12.1 (my laptop is running Catalina (10.15)), updated to cmake 3.22.1 and installed ninja and I am now trying a Qt 6.2.2 build natively. If that works, I will try an arm64 cross compile build. Work on porting Sigil master to Qt6 is underway and I need a Qt6 build to test for macOS specific issues. Once I get those ironed out hopefully that will give you extra Qt options for Apple M1 boxes.
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