When trying to emerge x11-misc/sddm-9999::qt I am getting the error messages: # emerge -avt sddm These are the packages that would be merged, in reverse order: Calculating dependencies... done! emerge: there are no ebuilds to satisfy "sys-auth/qauth[qt5(-)]". (dependency required by "x11-misc/sddm-9999::qt" [ebuild]) (dependency required by "sddm" [argument])
Try unmasking the qt5 USE flag: echo -qt5 >> /etc/portage/profile/use.mask
The dependency looks correct to me. It's probably what kensington said: the qt5 USE flag is masked on the reporter's system.