Every system that has a Qt development environment should have the matching moc tool, and having a qt.moc built by the wrong version of the moc tool causes problems.
Note that the CI checks won't test this, because they only build the default hiro backend on each platform, and Qt isn't the default anywhere. I promise it works on my machine, though! ;)
Every system that has a Qt development environment should have the matching moc tool, and having a qt.moc built by the wrong version of the moc tool causes problems.