Enabling multilib abi_x86_32 support on the stable Gentoo system

Currently the abi_x86_32 use flag is masked on the stable Gentoo system. Therefore turning the 32 option in the ABI_X86 variable, will not bring you further:

# cat /etc/portage/make.conf
...
ABI_X86="32 64"
...

and as a result the line

# emerge --ask --verbose --newuse --update --deep world

will show you an endless number of conflicts, which can not be directly resolved by portage. If you never the less wish to enable the 32 bit library support on your system, especially to make your 32 bit applications running well under wine, you should force the abi_x86_32 desired use flag. One of the possible solutions to achieve this would be:

# cat /etc/portage/profile/use.mask 
-abi_x86_32

Moreover, more additional packages are required to have a full multilib featured support. Many of them has not been marked as stable yet. An up to date list of this packages at the moment of writing can be found here:

# cat /etc/portage/package.keywords/multilib
=x11-libs/libxcb-1.9*
=x11-libs/xpyb-1.3.1-r3
=dev-libs/libusb-1.0.9-r2
=sys-libs/e2fsprogs-libs-1.42.7-r1
=sys-fs/e2fsprogs-1.42.8

=media-libs/libjpeg-turbo-1.3.0-r2 
=media-libs/libdvdnav-4.2.0-r1 
=media-libs/a52dec-0.7.4-r7 
=media-libs/libmpeg2-0.5.1-r2 
=sys-apps/attr-2.4.47-r1 
=media-sound/musepack-tools-465-r1 
=net-libs/libasyncns-0.8-r3 
=virtual/jpeg-0-r2 
=media-libs/libtheora-1.1.1-r1 
=media-sound/pulseaudio-4.0-r1 
=media-libs/webrtc-audio-processing-0.1-r1 
=dev-libs/fribidi-0.19.5-r2 
=app-arch/bzip2-1.0.6-r4 
=sys-libs/libavc1394-0.5.4-r1 
=media-libs/libid3tag-0.15.1b-r4 
=dev-libs/udis86-1.7-r2 
=media-sound/jack-audio-connection-kit-0.121.3-r1 
=media-sound/twolame-0.3.13-r1 
=media-libs/libdvdread-4.2.0-r1 
=media-plugins/alsa-plugins-1.0.27-r1 
=dev-libs/libcdio-paranoia-0.90_p1-r1 
=media-sound/gsm-1.0.13-r1 
=sys-libs/e2fsprogs-libs-1.42.8 
=dev-libs/json-c-0.11-r1 
=dev-libs/libpcre-8.33-r1 
=virtual/libusb-0-r1 
=sys-apps/dbus-1.6.18-r1 
=dev-libs/libusb-compat-0.1.5-r2 
=media-libs/faac-1.28-r4 
=media-libs/libsidplay-1.36.59-r1 
=media-libs/ladspa-sdk-1.13-r2 
=media-libs/libmms-0.6.2-r1 
=media-libs/libmad-0.15.1b-r8 
=sys-devel/llvm-3.3-r1 
=media-libs/libmikmod-3.3.3 
=virtual/libiconv-0-r1 
=sys-libs/gdbm-1.10-r1 
=media-libs/libmodplug-0.8.8.4-r1 
=sys-libs/gpm-1.20.7-r2 
=media-plugins/alsaequal-0.6-r1 
=media-libs/libsndfile-1.0.25-r1 
=media-libs/libdvdcss-1.2.13-r1 
=virtual/glu-9.0-r1 
=media-libs/libiec61883-1.2.0-r1 
=app-admin/eselect-cdparanoia-0.1 
=media-libs/flac-1.2.1-r5 
=media-video/ffmpeg-0.10.10 
=media-libs/libsamplerate-0.1.8-r1 
=media-libs/xvid-1.3.2-r1 
=media-libs/speex-1.2_rc1-r2 
=media-libs/libao-1.1.0-r2 
=media-libs/x264-0.0.20130912 
=dev-libs/gmp-5.1.3-r1 
=media-libs/libdca-0.0.5-r3 
=media-libs/libsidplay-2.1.1-r4 
=app-text/libpaper-1.1.24-r2 
=virtual/libusb-1-r1 
=media-libs/glu-9.0.0-r1 
=media-sound/cdparanoia-3.10.2-r6 
=media-libs/libcuefile-477-r1 
=media-libs/libv4l-1.0.0 
=x11-libs/libvdpau-0.7 
=media-sound/lame-3.99.5-r1 
=media-libs/alsa-lib-1.0.27.2 
=media-libs/freeglut-2.8.1-r1 
=dev-libs/libffi-3.0.13-r1 
=virtual/libffi-3.0.13-r1 
=sys-libs/libraw1394-2.1.0-r1 
=media-sound/wavpack-4.60.1-r1 
=media-libs/libreplaygain-477-r1 
=dev-libs/libcdio-0.90-r1 
=sys-libs/ncurses-5.9-r3 
=x11-proto/dri2proto-2.8-r1 
=media-plugins/caps-plugins-0.9.15 
=dev-libs/liboil-0.3.17-r2 
=media-libs/faad2-2.7-r3 
=sys-libs/libieee1284-0.2.11-r3 
=dev-libs/elfutils-0.156 
=media-libs/mesa-9.2.4 
=sys-apps/tcp-wrappers-7.6.22-r1 
=virtual/opengl-7.0-r1 
=media-libs/glew-1.10.0-r2 
=media-plugins/swh-plugins-0.4.15-r3 
=media-libs/libvisual-0.4.0-r3 
=media-libs/vo-aacenc-0.1.3 
=sys-libs/libcap-2.22-r2 
=x11-proto/xf86driproto-2.1.1-r1 
=media-libs/libshout-2.3.1-r1 
=media-libs/libdv-1.0.0-r3 
=media-sound/mpg123-1.16.0 
=media-libs/libogg-1.3.1 
=media-libs/libmimic-1.0.4-r2 
=media-libs/libvorbis-1.3.3-r1 
=media-libs/libvpx-1.2.0_pre20130625 
=x11-proto/glproto-1.4.16-r1 
=media-libs/portaudio-19_pre20111121-r1

If emerge still has troubles to resolve all conflict, try to temporarily remove all emul-linux-x86-* ebuilds first, and all conflict should go away. Enjoy Gentoo!!!

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