I installed games-arcade/primateplunge on my AMD64 laptop and it complies and runs just fine. I think it's safe to add "amd64" to its keywords. emerge info of the system I tested it on: Portage 2.0.54-r2 (default-linux/amd64/2005.1, gcc-3.4.5, glibc-2.3.6-r3, 2.6.14-gentoo-r5 x86_64) ================================================================= System uname: 2.6.14-gentoo-r5 x86_64 AMD Turion(tm) 64 Mobile Technology ML-30 Gentoo Base System version 1.6.14 dev-lang/python: 2.3.5, 2.4.2 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: [Not Present] dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1 sys-devel/binutils: 2.16.1-r2 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="amd64" AUTOCLEAN="yes" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=athlon64 -pipe -O2" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/lib/X11/xkb /usr/share/config" CONFIG_PROTECT_MASK="/etc/gconf /etc/splash /etc/terminfo /etc/env.d" CXXFLAGS="-march=athlon64 -pipe -O2" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks sandbox sfperms strict" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo" LC_ALL="sl_SI.utf8" LINGUAS="sl" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="amd64 X a52 aac aalib acpi alsa audiofile avi berkdb bitmap-fonts blender-game bzip2 cddb cdparanoia cdr cli crypt css cups curl dar64 dbus directfb divx4linux dri dv dvd dvdr dvdread effects emul-linux-x86 encode ethereal exif expat fam fat ffmpeg flac foomaticdb gd gdbm gif gimpprint glut glx gmp gpm gstreamer gtk2 hal idn ieee1394 imagemagick imlib input_devices_synaptics ipv6 isdnlog java javascript jpeg kde kipi lcms libcaca lua lzw lzw-tiff mad matroska mikmod mime mng mp3 mpeg musepack music musicbrainz ncurses nls noamazon nsplugin ode ogg on-the-fly-crypt openal opengl pam pcmcia pcre pdf perl png ppds pppd python qt quicktime readline reflection remix scanner sdl session slang sou speex spell spl sqlite ssl subp subtitles tcltk tcpd theora tidy tiff timidity truetype truetype-fonts type1-fonts ucs2 udev unicode usb userlocales utf8 vcd videos visualization voice vorbis wifi wmf xine xml xmms xorg xpm xv xvid zlib linguas_sl userland_GNU kernel_linux elibc_glibc" Unset: CTARGET, INSTALL_MASK, LANG, LDFLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PORTAGE_RSYNC_OPTS
Added ~amd64 keyword in portage
