The ebuild was just updated - the new version has file collisions with kde4. A blocker should be added Reproducible: Always
the colliding file is /usr/bin/kactivitymanagerd - since some application need the libraries from kactivities, it may be useful to rename the executable or optionally remove it in order to allow parallel installation of the two.
This has been brought up already ( https://git.reviewboard.kde.org/r/115602/ ), with the upstream decision being that kactivitymanagerd should be installed from the frameworks version and that it would be backwards compatible with KDE4. I've submitted a RR ( https://git.reviewboard.kde.org/r/118340/ ), that disables the daemon in kdelibs. If KDE is fine with the patch, I'll work on packaging it up for Gentoo.
Thanks, improved blocker to handle cases where kde-base/kactivities installed does not have minimal USE flag. http://git.overlays.gentoo.org/gitweb/?p=proj/kde.git;a=commit;h=2d1aa5ebeb7a384f57a6e9fad2713c21d2181a8d
would be awesome, if not only the git version from the overlay had the minimal USE flag