Compiling Anki 2.1.38 for Raspberry Pi 4/400 with Ubuntu 20.10 (architecture: aarch64)

Anki Desktop
16

5.15 should work, and this looks like a PyQt issue rather than a Qt issue. I presume you get a similar error if you run the following and wait a few seconds?

import sys
from PyQt5.Qt import *
from PyQt5.QtWebEngineWidgets import *
from PyQt5.QtWidgets import QApplication
from PyQt5 import sip


class WrappedView(QWebEngineView):
    pass


app = QApplication(sys.argv)
web = WrappedView()
web.load(QUrl("http://example.com"))
web.show()


def on_timer():
    print(sip.isdeleted(web))


timer = QTimer()
timer.setSingleShot(True)
timer.timeout.connect(on_timer)
timer.start(2000)

sys.exit(app.exec_())

If so, this problem does not appear to be specific to Anki, and if importing sip directly does not help, maybe someone on the PyQt mailing list might have a suggestion.