avahi-0.5.2 compiles and works perfectly on ppc (iBook) so it should be safe to keyword ~ppc. # 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 ppc) ================================================================= System uname: 2.6.14 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/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 exif fbcon firefox flac fortran gdbm 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 sdl spell sqlite 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
Added to ~ppc, thanks for testing.