Did pyside6 ever support macOS 10.13?
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The wheels on pypi seem to indicate 10.9 compatibility with some older builds but I always got this error, which indicates 10.14 minimum
https://stackoverflow.com/questions/72899365/importerror-dlopen-when-running-pyside6-app-python
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It doesn't appear so, no. The minimal version ever supported by Qt 6 (as seen in the 6.0 documentation archives) is 10.14 - https://doc.qt.io/archives/qt-6.0/supported-platforms.html.