It seems git master has already gained an option `-DPREFER_QT6` which is bundling KStatusNotifierItem from KDE (kde-frameworks/kstatusnotifieritem:6). My advice would be to configure 9999 unconditionally as Qt6-based already. https://github.com/ckb-next/ckb-next/pull/1057/commits/3100b9276c5ec90e6d2d8ab844a069604c8e38ae Maybe instead of bundling and reverting some upstream commit they should have instead tried to fix this upstream.