gnome compiles OK on my ppc, including gnome-keyring-manager-2.12.0 and
totem-1.2.0-r1
There are though a few gstreamer related packages that don't compile.
# emerge info Portage 2.0.51.22-r3 (default-linux/ppc/2005.1/ppc/G4, gcc-4.0.2,
glibc-2.3.5-r2, 2.6.14-rc5 ppc)
=================================================================
System uname: 2.6.14-rc5 ppc 7447A, altivec supported
Gentoo Base System version 1.6.13
dev-lang/python: 2.3.5, 2.4.2
sys-apps/sandbox: 1.2.12
sys-devel/autoconf: 2.13, 2.59-r6
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
sys-devel/libtool: 1.5.18-r1
virtual/os-headers: 2.6.11-r2
ACCEPT_KEYWORDS="ppc"
AUTOCLEAN="yes"
CBUILD="powerpc-unknown-linux-gnu"
CFLAGS="-O2 -mcpu=G4 -mtune=G4 -maltivec -mabi=altivec -pipe -fomit-frame-pointer"
CHOST="powerpc-unknown-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config
/usr/lib/X11/xkb /usr/share/X11/xkb /usr/share/config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-O2 -mcpu=G4 -mtune=G4 -maltivec -mabi=altivec -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig distlocks sandbox sfperms strict"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/Linux/distributions/gentoo"
LANG="en_US.UTF-8"
LC_ALL="en_US.UTF-8"
LDFLAGS="-Wl,-O1"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage /usr/local/gentopia"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="ppc X a52 aac acl alsa altivec berkdb bitmap-fonts bluetooth cairo cdr
crypt cups dbus dga dri dvd dvdr eds emboss evo fbcon firefox flac fortran gif
gimpprint glitz gnome gphoto2 gpm gstreamer gtk gtk2 hal howl ieee1394 ipv6 jpeg
libwww logrotate matroska mng mono mp3 mpeg nautilus ncurses nfs nls nptl
nptlonly nsplugin ogg oggvorbis opengl pam pci pdflib perl pic pie png pnp posix
ppds python readline samba scanner spell ssl svg symlink tcpd theora tiff
truetype truetype-fonts type1-fonts udev unicode usb vorbis xml2 xv zlib
userland_GNU kernel_linux elibc_glibc"
Unset: ASFLAGS, CTARGET, LINGUAS
