This has been in portage for quite some time. Its ready to go stable.
x86 stable
net-p2p/transmission-0.6.1 works on ppc Portage 2.1.1-r2 (default-linux/ppc/ppc32/2006.1/G4, gcc-4.1.1, glibc-2.4-r4, 2.6.18-gentoo-r3 ppc) ================================================================= System uname: 2.6.18-gentoo-r3 ppc 7447A, altivec supported Gentoo Base System release 1.12.6 Last Sync: Wed, 24 Jan 2007 14:30:01 +0000 app-admin/eselect-compiler: [Not Present] dev-java/java-config: 1.3.7, 2.0.31 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, 2.61 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10 sys-devel/binutils: 2.17 sys-devel/gcc-config: 1.3.14 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.17-r2 ACCEPT_KEYWORDS="ppc" AUTOCLEAN="yes" CBUILD="powerpc-unknown-linux-gnu" CFLAGS="-O2 -pipe -mcpu=G4 -maltivec -mabi=altivec -fno-strict-aliasing" CHOST="powerpc-unknown-linux-gnu" CONFIG_PROTECT="/etc /usr/share/X11/xkb" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/java-config/vms/ /etc/terminfo" CXXFLAGS="-O2 -pipe -mcpu=G4 -maltivec -mabi=altivec -fno-strict-aliasing" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict" GENTOO_MIRRORS="http://ftp.belnet.be/mirror/rsync.gentoo.org/gentoo/ ftp://ftp.belnet.be/mirror/rsync.gentoo.org/gentoo/ http://ftp.club-internet.fr/pub/mirrors/gentoo " LANG="fr_FR@euro" LC_ALL="fr_FR@euro" LINGUAS="fr fr_FR" 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="ppc X alsa alsa_cards_aoa alsa_cards_aoa-fabric-layout alsa_cards_aoa-onyx alsa_cards_aoa-soundbus alsa_cards_aoa-soundbus-i2s alsa_cards_aoa-tas alsa_cards_aoa-toonie alsa_cards_powermac alsa_cards_usb-audio alsa_cards_via82xx 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 altivec apache2 berkdb bitmap-fonts bonobo cdr cli cracklib crypt cups dbus dlloader dri dvd dvdread eds elibc_glibc emboss encode esd ffmpeg firefox fortran gdbm gif gpm gstreamer gtk gtk2 gtkhtml hal iconv input_devices_keyboard input_devices_mouse ipv6 isdnlog jpeg kernel_linux lcd_devices_bayrad lcd_devices_cfontz lcd_devices_cfontz633 lcd_devices_glk lcd_devices_hd44780 lcd_devices_lb216 lcd_devices_lcdm001 lcd_devices_mtxorb lcd_devices_ncurses lcd_devices_text ldap libg++ libwww linguas_fr linguas_fr_FR mad matroska mikmod mozilla mp3 mpeg mplayer msn ncurses nls nptl nptlonly ogg opengl pam pcre pdf perl png pppd python quicktime readline reflection ruby sdl session spell spl ssl tcpd truetype truetype-fonts type1-fonts udev unicode userland_GNU video_cards_radeon vorbis wifi xml xorg xv zlib" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LDFLAGS, MAKEOPTS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
amd64 stable
