Back to this, as I just hit the same problem I googled it and found https://bugs.kde.org/show_bug.cgi?id=454063 So it looks like it should only work (in stable and later, which have gdb >= 12) only if WITH_GDB12 is set at the drkonqi build time. https://salsa.debian.org/qt-kde-team/kde/drkonqi/-/blob/master/debian/rules doesn't set it, so I think this needs to be changed.