I have seen several ebuilds (libreoffice and sigil for example) drop all python2.7 support. However this leads to the below use constraint as the default for PYTHON_SINGLE_TARGET is still at 2 while the default for PYTHON_TARGETS is 3. A workaround is to add the neccesary target in package.use but this is not really nice. !!! The ebuild selected to satisfy "app-office/libreoffice" has unmet requirements. - app-office/libreoffice-5.1.0.3::gentoo USE="bluetooth branding cups dbus gltf gnome gstreamer gtk java jemalloc kde mysql odk vlc (-aqua) -coinmp -collada -debug -eds (-firebird) -gtk3 -libressl -postgres (-telepathy) -test" ABI_X86="64" LIBREOFFICE_EXTENSIONS="-nlpsolver -scripting-beanshell -scripting-javascript -wiki-publisher" PYTHON_SINGLE_TARGET="-python3_4 -python3_5" PYTHON_TARGETS="python3_4 -python3_5" The following REQUIRED_USE flag constraints are unsatisfied: exactly-one-of ( python_single_target_python3_4 python_single_target_python3_5 ) The above constraints are a subset of the following complete expression: exactly-one-of ( python_single_target_python3_4 python_single_target_python3_5 ) python_single_target_python3_4? ( python_targets_python3_4 ) python_single_target_python3_5? ( python_targets_python3_5 ) bluetooth? ( dbus ) collada? ( gltf ) eds? ( gnome ) gnome? ( gtk ) telepathy? ( gtk ) libreoffice_extensions_nlpsolver? ( java ) libreoffice_extensions_scripting-beanshell? ( java ) libreoffice_extensions_scripting-javascript? ( java ) libreoffice_extensions_wiki-publisher? ( java ) (dependency required by "@selected" [set]) (dependency required by "@world" [argument]) Reproducible: Always # emerge --info !!! Repository 'betagarden' has sync-uri attribute, but is missing sync-type attribute !!! Repository 'tox-overlay' has sync-uri attribute, but is missing sync-type attribute !!! Invalid PORTDIR_OVERLAY (not a dir): '/var/lib/layman/elementary' Portage 2.2.27 (python 3.4.3-final-0, default/linux/amd64/13.0/desktop, gcc-5.3.0, glibc-2.22-r2, 4.4.2-gentoo x86_64) ================================================================= System uname: Linux-4.4.2-gentoo-x86_64-Intel-R-_Core-TM-_i7-3770K_CPU_@_3.50GHz-with-gentoo-2.2 KiB Mem: 15321760 total, 3152332 free KiB Swap: 8388604 total, 8388268 free sh bash 4.3_p42-r2 ld GNU ld (Gentoo 2.25.1 p1.1) 2.25.1 app-shells/bash: 4.3_p42-r2::gentoo dev-java/java-config: 2.2.0-r3::gentoo dev-lang/perl: 5.22.1::gentoo dev-lang/python: 2.7.11-r2::gentoo, 3.4.3-r7::gentoo, 3.5.1-r2::gentoo dev-util/cmake: 3.4.3::gentoo dev-util/pkgconfig: 0.29::gentoo sys-apps/baselayout: 2.2::gentoo sys-apps/openrc: 0.20.5::gentoo sys-apps/sandbox: 2.10-r1::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69-r1::gentoo sys-devel/automake: 1.11.6-r2::gentoo, 1.12.6-r1::gentoo, 1.13.4-r1::gentoo, 1.14.1-r1::gentoo, 1.15-r2::gentoo sys-devel/binutils: 2.25.1-r1::gentoo sys-devel/gcc: 5.3.0::gentoo sys-devel/gcc-config: 1.8-r1::gentoo sys-devel/libtool: 2.4.6-r2::gentoo sys-devel/make: 4.1-r1::gentoo sys-kernel/linux-headers: 4.4::gentoo (virtual/os-headers) sys-libs/glibc: 2.22-r2::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.nl.gentoo.org/gentoo-portage priority: -1000 mate location: /home/sander/repos/mate-overlay masters: gentoo priority: 0 jitsi location: /home/sander/repos/jitsi masters: gentoo priority: 2 mate-community location: /home/sander/repos/mate-community masters: gentoo priority: 3 infirit location: /home/sander/repos/infirit masters: gentoo priority: 4 betagarden location: /var/lib/layman/betagarden sync-uri: https://anongit.gentoo.org/git/proj/betagarden.git masters: gentoo priority: 50 eva location: /var/lib/layman/eva masters: gentoo priority: 50 kde location: /var/lib/layman/kde sync-type: laymansync sync-uri: git://anongit.gentoo.org/proj/kde.git masters: gentoo priority: 50 psix-overlay location: /var/lib/layman/psix-overlay masters: gentoo priority: 50 rion location: /var/lib/layman/rion masters: gentoo priority: 50 seafile location: /var/lib/layman/seafile masters: gentoo priority: 50 tox-overlay location: /var/lib/layman/tox-overlay sync-uri: git@github.com:Tox/gentoo-overlay-tox.git masters: gentoo priority: 50 ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe -march=native" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs compress-build-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync network-sandbox news parallel-fetch parallel-install preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="ftp://ftp.snt.utwente.nl/pub/os/linux/gentoo" LANG="nl_NL.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j6" PKGDIR="/usr/portage/packages" PORTAGE_COMPRESS="bzip2" PORTAGE_COMPRESS_FLAGS="-9" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/var/tmp" USE="X a52 aac acl acpi alsa amd64 aspell avahi avx berkdb bluetooth bluray branding bzip2 cairo caja canberra caps cdda cddb cdio cdr cjk cli consolekit corefonts cracklib crypt cue cups curl cxx dbus dconf device-mapper dri dts dv dvd dvdr egl emboss encode exif faac faad fam ffmpeg firefox flac fontconfig fontforge fortran gdbm gif glamor gles gles1 gles2 gmp gnome-keyring gpm gstreamer gtk gtk3 hires-icons iconv icu idn introspection ipv6 jpeg jpeg2k kde lame lcms ldap libcanberra libnotify libsecret lm_sensors lzma lzo mad mate mate-keyring mmx mmxext mng modules mp3 mp4 mpeg mtp multilib musepack musicbrainz ncurses networkmanager nls nptl nsplugin offensive ogg openal opengl openldap openmp opus osmesa pam pango pch pcre pdf phonon png policykit ppds ppp pulseaudio python qt3support qt4 qt5 readline resolvconf rle samba sasl scanner schroedinger sdl seccomp session sndfile speex spell sse sse2 sse3 sse4 sse4_1 sse4_2 ssl ssse3 startup-notification svg syslog tcpd telepathy theora threads tiff truetype udev udisks unicode upnp upower usb usbredir v4l vaapi vdpau vorbis vpx wavpack wayland webp wmf wxwidgets x264 x265 xattr xcb xml xmp xpm xscreensaver xv xvid xvmc zeroconf zip zlib" ABI_X86="32 64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" 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 auth_digest dav_fs authn_file dav authz_groupfile" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" ENLIGHTENMENT_MODULES="backlight battery clock comp conf-applications conf-dialogs conf-display conf-edgebindings conf-interaction conf-intl conf-keybindings conf-menus conf-paths conf-performance conf-randr conf-shelves conf-theme conf-window-manipulation conf-window-remembers connman cpufreq dropshadow everything fileman fileman-opinfo gadman ibar ibox illume2 mixer msgbus notification pager quickaccess start syscon systray tasks temperature tiling winlist wizard xkbswitch access shot mate-keyring" 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 ublox ubx" GRUB_PLATFORMS="efi-64 efi-32 pc" INPUT_DEVICES="keyboard mouse evdev joystick" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en en_GB en_US nl it_IT fr_FR es_ES ru_RU ru" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby20 ruby21 ruby22 ruby23" USERLAND="GNU" VIDEO_CARDS="intel fbdev vesa" 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" Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
Expect that to happen more often in ~arch when packages begin to drop python2_7 support while other packages still haven't picked up python3*. I'd only consider it a bug for arch though.
*** This bug has been marked as a duplicate of bug 472932 ***
