I have switched to the non-multilib branch of x11 overlay to restore my system to the previous state, and when trying to merge all the packages which have changed: These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R #] x11-libs/libXau-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libdrm-9999::x11 USE="libkms -static-libs (-multilib%*)" VIDEO_CARDS="nouveau radeon (-exynos) -intel (-omap) -vmware" 0 kB [ebuild R #] x11-libs/libICE-9999::x11 USE="ipv6 -doc -static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXdmcp-9999::x11 USE="-doc -static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libfontenc-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libxkbcommon-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libxcb-9999::x11 USE="-doc (-selinux) -static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libSM-9999::x11 USE="ipv6 uuid -doc -static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libX11-9999::x11 USE="ipv6 -doc -static-libs {-test} (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXext-9999::x11 USE="-doc -static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXfixes-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXrender-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libxkbfile-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXdamage-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXv-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXxf86vm-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXi-9999::x11 USE="-doc -static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXrandr-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libdmx-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libxkbui-9999::x11 USE="-static-libs (-multilib%*)" 0 kB [ebuild R #] x11-libs/libXtst-9999::x11 USE="-static-libs (-multilib%*)" 0 kB Total: 21 packages (21 reinstalls), Size of downloads: 0 kB Traceback (most recent call last): File "/usr/bin/emerge", line 48, in <module> retval = emerge_main() File "/usr/lib64/portage/pym/_emerge/main.py", line 1021, in emerge_main gc_locals=locals().clear) File "/usr/lib64/portage/pym/_emerge/actions.py", line 3837, in run_action myopts, myaction, myfiles, spinner) File "/usr/lib64/portage/pym/_emerge/actions.py", line 316, in action_build mydepgraph.display_problems() File "/usr/lib64/portage/pym/_emerge/depgraph.py", line 6700, in display_problems self._show_slot_collision_notice() File "/usr/lib64/portage/pym/_emerge/depgraph.py", line 781, in _show_slot_collision_notice self._dynamic_config._slot_conflict_handler = slot_conflict_handler(self) File "/usr/lib64/portage/pym/_emerge/resolver/slot_collision.py", line 131, in __init__ self._prepare_conflict_msg_and_check_for_specificity() File "/usr/lib64/portage/pym/_emerge/resolver/slot_collision.py", line 315, in _prepare_conflict_msg_and_check_for_specificity for flag in violated_atom.use.enabled.union(violated_atom.use.disabled): AttributeError: 'NoneType' object has no attribute 'enabled' -- Portage 2.2.0_alpha142 (default/linux/amd64/10.0/desktop, gcc-4.7.2, glibc-2.16.0, 3.7.0-mgorny-amd64+ x86_64) ================================================================= System uname: Linux-3.7.0-mgorny-amd64+-x86_64-AMD_Athlon-tm-_64_X2_Dual_Core_Processor_3800+-with-gentoo-2.2 Timestamp of tree: Mon, 21 Jan 2013 13:45:01 +0000 ld GNU ld (GNU Binutils) 2.23.1 distcc 3.1 x86_64-pc-linux-gnu [enabled] app-shells/bash: 4.2_p42 dev-lang/python: 2.5.4-r5, 2.6.8-r1, 2.7.3-r3, 3.1.5-r1, 3.2.3-r2, 3.3.0-r1 dev-util/cmake: 2.8.10.2-r1 dev-util/pkgconfig: 0.27.1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.11.8 sys-apps/sandbox: 2.6 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.11.6, 1.12.6, 1.13.1 sys-devel/binutils: 2.23.1 sys-devel/gcc: 4.7.2 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.7 (virtual/os-headers) sys-libs/glibc: 2.16.0 Repositories: gentoo mgorny vdr-devel vdr-testing x11 sunrise Installed sets: @mg_depends, @mg_vdr, @system ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=athlon64 -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt /var/yp/Makefile" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-march=athlon64 -O2 -pipe" DISTDIR="/srv/nfs/common/distfiles" EMERGE_DEFAULT_OPTS="--with-bdeps y --ask --keep-going --quiet-build=n" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs collision-protect config-protect-if-modified distcc distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="pl_PL.UTF-8" LC_ALL="pl_PL.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu" MAKEOPTS="-j6" PKGDIR="/srv/nfs/common/packages/athlon64" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --times --compress --force --whole-file --delete --stats --timeout=45 --exclude=/distfiles --exclude=/packages --exclude=/local --exclude=CVS --exclude=/metadata/cache" PORTAGE_TMPDIR="/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/var/lib/layman/mgorny /var/lib/layman/vdr-devel /var/lib/layman/vdr-testing /var/lib/layman/x11 /var/lib/layman/sunrise" SYNC="ssh://pomiocik//usr/portage" USE="3dnow 3dnowext X a52 aac aio alsa amd64 bash-completion bluetooth branding bzip2 cairo caps cdda cdr cli crypt cxx dbus dri dts dvb dvd dvdr emboss exif firefox flac fontconfig fortran gd gif gmp iconv idn imagemagick ipv6 jpeg jpeg2k lcms libnotify lzo mad mmap mmx mmxext mng modules mp3 mp4 mpeg mudflap multilib ncurses nls nptl ogg openal opengl openmp pam pango pch pcre pdf png ppds qt3support readline sdl session slang smp speex sse sse2 ssl startup-notification svg tcpd threads tiff truetype udev udisks unicode upower usb v4l2 vim-syntax vorbis wavpack wxwidgets x264 xattr xcb xml xpm xv xvid xvmc zlib" ALSA_CARDS="hda-intel emu10k1 virmidi mpu401 pcsp" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LIRC_DEVICES="serial" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7" QEMU_SOFTMMU_TARGETS="i386 x86_64 ppc ppc64 ppc64abi32 arm" QEMU_USER_TARGETS="ppc ppc64 arm" RUBY_TARGETS="ruby18 ruby19" SANE_BACKENDS="artec_eplus48u" USERLAND="GNU" VIDEO_CARDS="nouveau vesa radeon r600 s3" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" USE_PYTHON="2.7" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
This is fixed in git: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=2f9ee1635ca33f347e6eaa523e965c7172cd481e In this case the problem was triggered by inconsistency in match logic for x11-libs/libX11[multilib(-)] matched against x11-libs/libX11-9999::x11, since it did not have multilib in IUSE, but multilib was enabled anyway via implicit IUSE.
This is fixed in 2.1.11.48 and 2.2.0_alpha159.
Here's a fix for a related issue: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=9ae58b611e7a0d2080f0f48c207c7323dfa06dc3
