patch and ebuild update to get arts to build and work on amd64. This is the only component of KDE that didn't build out-of-the-box.
Created attachment 18419 [details, diff] patch for arts on amd64
Created attachment 18420 [details, diff] patch for arts ebuild for amd64
committed. thanks. also, it may be beneficial to submit this fix to the kde folks so it gets patched upstream as well.