This list is based on the beta tarballs with some (already committed) fixes on top to fix build with latest kdiagram and plasma-activities.
Frameworks: - ktexteditor: conflicts with KF5 /usr/share/dbus-1/system-services/org.kde.ktexteditor.katetextbuffer.service /usr/share/dbus-1/system.d/org.kde.ktexteditor.katetextbuffer.conf /usr/share/polkit-1/actions/org.kde.ktexteditor.katetextbuffer.policy - purpose: conflicts with KF5 /usr/share/icons/hicolor/128x128/apps/phabricator-purpose.png /usr/share/icons/hicolor/128x128/apps/reviewboard-purpose.png /usr/share/icons/hicolor/16x16/apps/phabricator-purpose.png /usr/share/icons/hicolor/16x16/apps/reviewboard-purpose.png Plasma: - plasma-activities: conflicts with kdebugsettings /usr/share/qlogging-categories6/kde.renamecategories Gear: - kdepim-runtime: FTBFS with etesync - there's a missing QtConcurrent dependency, but even after adding it build fails https://invent.kde.org/pim/kdepim-runtime/-/merge_requests/137 - audiotube: FTBFS. It seems to be in a weird, half-ported state https://bugs.kde.org/show_bug.cgi?id=477390 - libkcddb: Qt5/6 versions collide (translations and desktop files). Qt5 version still needed for k3b, soundkonverter, tellico - analitza: Qt5/6 versions collide (same lib name). Qt5 version optionally needed by cantor (workaround: disable kalgebra backend in cantor) - keduvocdocument: Qt5/6 versions collide (same lib name). Qt5 version is a hard dependency of parley, this blocks packaging parley - krfb: requires Qt5 kpipewire, which collides with its Qt5 version. Useless without it on Wayland. - ksanecore: Qt5/6 versions collide. Qt6 version needed by skanpage, Qt5 version needed by skanlite. - kpublictransport: Qt5/6 versions collide. Qt5 version needed by kosmindoormap and itinerary. Blocks packaging itinerary. - pim libraries: translations collide with the Qt5 versions, still needed by some apps (digikam, kmymoney). - qmlkonsole: builds fine, but it's useless since there is no Qt6 version of qmltermwidget. - kio-extras: KF5/6 versions collide: /usr/include/KioArchive/kio_archivebase.h /usr/include/KioArchive/kioarchive_version.h /usr/include/KioArchive/libkioarchive_export.h /usr/lib/cmake/KioArchive/KioArchiveConfig.cmake /usr/lib/cmake/KioArchive/KioArchiveConfigVersion.cmake /usr/lib/cmake/KioArchive/KioArchiveTargets-noconfig.cmake /usr/lib/cmake/KioArchive/KioArchiveTargets.cmake /usr/lib/libkioarchive.so.5 /usr/lib/libkioarchive.so.5.98.0 /usr/share/dbus-1/services/org.kde.kmtpd5.service /usr/share/konqueror/dirtree/remote/mtp-network.desktop /usr/share/remoteview/afc-network.desktop /usr/share/remoteview/mtp-network.desktop /usr/share/solid/actions/solid_afc.desktop /usr/share/solid/actions/solid_mtp.desktop Other: - libquotient: Qt5/6 versions collide. Qt5 version optionally needed by itinerary. - kirigami-addons: Qt5/6 versions collide (translations) - phonon: Qt5/6 versions collide (translations) Missing releases of dependencies: - tokodon, neochat (optionally) depend on unreleased kunifiedpush - plasmatube, tokodon hard depend on unreleased mpv-qt - libkscreen depends on unreleased changes in plasma-wayland-protocols