I have all of the packages below installed on my system, so I believe that it's ok to mark them as ~x64-macos: app-doc/devmanual-0_pre20130309 app-doc/single-unix-specification-4-r1 app-misc/terminal-colors-2.2 app-vim/alternate-2.18 app-vim/colorschemes-20130124 app-vim/eselect-syntax-20070506 app-vim/fugitive-1.2 app-vim/gist-7.1 app-vim/gundo-2.5.0 app-vim/nerdtree-4.2.0 app-vim/pathogen-2.2 app-vim/webapi-0.2 dev-libs/mpc-1.0.1 dev-python/six-9999 media-fonts/anonymous-pro-1.002 media-fonts/efont-unicode-0.4.2-r1 media-fonts/font-bh-ttf-1.0.3 media-fonts/font-bh-type1-1.0.3 media-fonts/roboto-20120823 media-fonts/sil-charis-4.110 media-fonts/sil-gentium-1.508 media-fonts/source-pro-20130316 media-fonts/ttf-bitstream-vera-1.10-r3 media-gfx/ebdftopcf-2 media-gfx/fondu-20060102-r1 media-gfx/povray-3.7.0_rc7 media-libs/libwebp-0.3.1 sci-libs/cblas-reference-20030223-r5 sci-libs/fftw-3.3.3-r3 sys-apps/rename-1.3 sys-devel/boost-m4-0.4 sys-devel/gcc-4.7.2-r1 virtual/cblas-1.0 virtual/lapack-3.1 x11-apps/bdftopcf-1.0.4 x11-apps/xfontsel-1.0.5 x11-libs/libXp-1.0.2 x11-libs/motif-2.3.4-r1 x11-misc/xbitmaps-1.1.1 x11-proto/printproto-1.0.5-r1 Reproducible: Always
app-doc/devmanual-0_pre20130309 app-doc/single-unix-specification-4-r1 app-misc/terminal-colors-2.2 done
all done, thanks