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Sebastian Holtermann authored
For Qt4 it was not possible to pass all compiler implicit include directories to moc because it couldn't handle some system headers. For reference see commit 753b905e, commit d2536579 and [QTBUG-28045](https://bugreports.qt.io/browse/QTBUG-28045). For Qt5's moc the problem does not persist anymore so we can (and should) pass all implicit include directories to moc. Fixes #18041
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