I added ~amd64 to the ebuild (1.3) and digested it, using it for one hour now
with no issues.
My emerge info:
Portage 2.1.1-r2 (default-linux/amd64/2006.1, gcc-4.1.1, glibc-2.4-r4,
2.6.18-gentoo x86_64)
=================================================================
System uname: 2.6.18-gentoo x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor
4600+
Gentoo Base System version 1.12.6
Last Sync: Wed, 27 Dec 2006 22:30:01 +0000
app-admin/eselect-compiler: [Not Present]
dev-java/java-config: 1.3.7, 2.0.30
dev-lang/python: 2.4.3-r4
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, 2.60
sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2
sys-devel/binutils: 2.16.1-r3
sys-devel/gcc-config: 1.3.13-r4
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="-O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /home/mythtv/ /usr/NX/etc /usr/NX/home /usr/kde/3.5/env
/usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/X11/xkb
/usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf
/etc/java-config/vms/ /etc/revdep-rebuild /etc/terminfo"
CXXFLAGS="-O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig distlocks metadata-transfer sfperms strict"
GENTOO_MIRRORS="ftp://cs.ubishops.ca/pub/gentoo http://gentoo.osuosl.org/
ftp://ftp.gtlib.gatech.edu/pub/gentoo "
LINGUAS="en th"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude='/distfiles' --exclude='/local' --exclude='/packages'"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="amd64 X aac aalib acpi aim alsa alsa_cards_ali5451 alsa_cards_als4000
alsa_cards_atiixp alsa_cards_atiixp-modem alsa_cards_bt87x alsa_cards_ca0106
alsa_cards_cmipci alsa_cards_emu10k1x alsa_cards_ens1370 alsa_cards_ens1371
alsa_cards_es1938 alsa_cards_es1968 alsa_cards_fm801 alsa_cards_hda-intel
alsa_cards_intel8x0 alsa_cards_intel8x0m alsa_cards_maestro3 alsa_cards_trident
alsa_cards_usb-audio alsa_cards_via82xx alsa_cards_via82xx-modem
alsa_cards_ymfpci alsa_pcm_plugins_adpcm alsa_pcm_plugins_alaw
alsa_pcm_plugins_asym alsa_pcm_plugins_copy alsa_pcm_plugins_dmix
alsa_pcm_plugins_dshare alsa_pcm_plugins_dsnoop alsa_pcm_plugins_empty
alsa_pcm_plugins_extplug alsa_pcm_plugins_file alsa_pcm_plugins_hooks
alsa_pcm_plugins_iec958 alsa_pcm_plugins_ioplug alsa_pcm_plugins_ladspa
alsa_pcm_plugins_lfloat alsa_pcm_plugins_linear alsa_pcm_plugins_meter
alsa_pcm_plugins_mulaw alsa_pcm_plugins_multi alsa_pcm_plugins_null
alsa_pcm_plugins_plug alsa_pcm_plugins_rate alsa_pcm_plugins_route
alsa_pcm_plugins_share alsa_pcm_plugins_shm alsa_pcm_plugins_softvol apache2
arts audiofile berkdb bitmap-fonts browserplugin cli cpudetection cracklib
crypt cups dbus dga directfb divx4linux dlloader dri dvd dvdr dvdread
elibc_glibc encode fbcon ffmpeg firefox flac flash fltk font-server foomaticdb
fortran gdbm gif gphoto2 gstreamer gtk gtk2 hal iconv icq imagemagick imap
imlib innodb input_devices_evdev input_devices_keyboard input_devices_mouse
isdnlog jabber java joystick jpeg kde kdehiddenvisibility kerberos kernel_linux
ldap libcaca libg++ libwww linguas_en linguas_th lirc live lm_sensors
logitech-mouse mad mikmod ming mmap mozcalendar mp3 mpeg musicbrainz mysql
mythtv ncurses nls nptl nptlonly nsplugin nvidia odbc offensive ofx ogg openal
opengl oss pam pcre pdflib perl plotutils png postgres ppds pppd python qt3
quicktime rdesktop readline reflection rtc ruby samba scanner sdl session
socks5 speex spl sqlite ssl svg tcltk tcpd theora tidy tiff tk truetype
truetype-fonts type1-fonts udev unicode usb userland_GNU v4l v4l2 vcd
video_cards_nvidia videos vorbis wmf xcomposite xine xml xml2 xorg xprint xv
xvid xvmc yahoo zeo zeroconf zlib"
Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, LDFLAGS,
PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
