These ebuilds depend on virtual/texi2dvi: $ equery d virtual/texi2dvi [ Searching for packages depending on virtual/texi2dvi... ] app-text/dvipng-1.11 (virtual/texi2dvi) media-gfx/asymptote-1.43 (doc? virtual/texi2dvi) $ "ecopy virtual/texi2dvi" works fine on amd64-linux.
added, thanks!