sci-electronics/geda-suite sci-electronics/gnetman sci-electronics/gwave sci-electronics/gtkwave sci-electronics/gerbv all above packages need ~amd64 keywords in ebuilds, i have altered the ebuilds myself adding the keywords ~amd64 and then rebuilding the digests, it seems to install fine the programs function as well.
Please check our bugs before commit a new one... there are already open bugs for keywording this applications.