gladiator ~ # emerge -uDNav world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U  ] dev-libs/mpfr-3.1.5:0/4::gentoo [3.1.4:0/0::gentoo] USE="-static-libs" ABI_X86="(64) -32 (-x32)" 1,101 KiB
[ebuild     U  ] virtual/libc-1::gentoo [0::gentoo] 0 KiB
[ebuild     U  ] sys-libs/readline-7.0:0/7::gentoo [6.3_p8-r2:0/0::gentoo] USE="-static-libs -utils" ABI_X86="(64) -32 (-x32)" 2,842 KiB
[ebuild     U  ] app-shells/bash-4.4::gentoo [4.3_p46-r1::gentoo] USE="net nls (readline) -afs -bashlogger -examples -mem-scramble -plugins -vanilla" 9,158 KiB
[ebuild   R    ] dev-python/python-zipstream-1.1.4::gentoo  USE="{-test}" PYTHON_TARGETS="python2_7%* python3_4 -python3_5%" 0 KiB
[ebuild     U  ] x11-proto/xproto-7.0.31::gentoo [7.0.29::gentoo] USE="-doc" ABI_X86="32 (64) (-x32)" 294 KiB
[ebuild     U  ] dev-libs/nspr-4.13::gentoo [4.12::gentoo] USE="-debug" ABI_X86="(64) -32 (-x32)" 1,110 KiB
[ebuild     U  ] dev-libs/nss-3.27::gentoo [3.26::gentoo] USE="nss-pem -cacert -utils" ABI_X86="(64) -32 (-x32)" 7,224 KiB
[ebuild     U  ] media-libs/harfbuzz-1.3.2:0/0.9.18::gentoo [1.3.1:0/0.9.18::gentoo] USE="cairo glib graphite icu introspection truetype -fontconfig -static-libs {-test}" ABI_X86="(64) -32 (-x32)" 1,327 KiB
[ebuild     U  ] media-libs/libass-0.13.3:0/5::gentoo [0.13.2:0/5::gentoo] USE="fontconfig harfbuzz -static-libs" ABI_X86="(64) -32 (-x32)" 343 KiB
[ebuild     U  ] media-libs/openjpeg-2.1.1_p20160922:2/7::gentoo [2.1.0-r1:2/7::gentoo] USE="-doc -static-libs {-test}" ABI_X86="(64) -32 (-x32)" 1,958 KiB
[ebuild     U  ] sys-apps/openrc-0.22::gentoo [0.21.7::gentoo] USE="ncurses netifrc pam unicode -audit -debug -newnet (-prefix) (-selinux) -static-libs -tools" 211 KiB
[ebuild     U  ] net-misc/openssh-7.3_p1-r6::gentoo [7.3_p1-r5::gentoo] USE="X hpn ldap pam pie ssl -X509 -bindist -debug -kerberos -ldns -libedit -libressl -livecd -sctp (-selinux) -skey -ssh1 -static {-test}" 0 KiB
[ebuild     U  ] net-print/hplip-3.16.9::gentoo [3.16.8::gentoo] USE="X hpcups policykit qt5 snmp -doc -fax -hpijs -kde -libusb0 -minimal -parport -qt4 -scanner -static-ppds" PYTHON_SINGLE_TARGET="python3_4 -python2_7 (-python3_3)" PYTHON_TARGETS="python2_7 python3_4 (-python3_3)" 22,517 KiB
[ebuild     U  ] app-emulation/qemu-2.7.0-r4::gentoo [2.7.0-r3::gentoo] USE="aio alsa bluetooth bzip2 caps curl fdt filecaps gnutls gtk jpeg ncurses nls opengl pin-upstream-blobs png pulseaudio python sdl seccomp threads usb uuid vhost-net vnc xattr -accessibility -debug -glusterfs -gtk2 -infiniband -iscsi -lzo -nfs -numa -rbd -sasl -sdl2 (-selinux) -smartcard -snappy -spice -ssh -static -static-softmmu -static-user -systemtap -tci {-test} -usbredir -vde -virgl -virtfs -vte -xen -xfs" LINGUAS="-bg -de_DE -fr_FR -hu -it -tr -zh_CN" PYTHON_TARGETS="python2_7" QEMU_SOFTMMU_TARGETS="x86_64 -aarch64 -alpha -arm -cris -i386 -lm32 -m68k -microblaze -microblazeel -mips -mips64 -mips64el -mipsel -moxie -or32 -ppc -ppc64 -ppcemb -s390x -sh4 -sh4eb -sparc -sparc64 -tricore -unicore32 -xtensa -xtensaeb" QEMU_USER_TARGETS="-aarch64 -alpha -arm -armeb -cris -i386 -m68k -microblaze -microblazeel -mips -mips64 -mips64el -mipsel -mipsn32 -mipsn32el -or32 -ppc -ppc64 -ppc64abi32 -ppc64le -s390x -sh4 -sh4eb -sparc -sparc32plus -sparc64 -tilegx -unicore32 -x86_64" 0 KiB
[ebuild     U  ] media-sound/mpg123-1.23.8::gentoo [1.23.7::gentoo] USE="alsa ipv6 pulseaudio sdl (-altivec) (-coreaudio) -int-quality -jack -nas -oss -portaudio" ABI_X86="32 (64) (-x32)" CPU_FLAGS_X86="sse (-3dnow) (-3dnowext) (-mmx)" 873 KiB
[ebuild     U  ] media-libs/opencv-3.1.0-r5:0/3.1::gentoo [3.1.0-r4:0/3.1::gentoo] USE="eigen ffmpeg gstreamer gtk java jpeg opengl openmp png python tiff vaapi -contrib -cuda -examples -gdal -gphoto2 -ieee1394 (-ipp) -jpeg2k -libav -opencl -openexr -pch -qt4 -qt5 -testprograms -threads -v4l -vtk -webp -xine" PYTHON_SINGLE_TARGET="(-python2_7%*) (-python3_4%) (-python3_5%)" PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB

Total: 17 packages (16 upgrades, 1 reinstall), Size of downloads: 48,954 KiB

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

sys-libs/readline:0

  (sys-libs/readline-7.0:0/7::gentoo, ebuild scheduled for merge) pulled in by
    >=sys-libs/readline-7.0_rc2:0= required by (app-shells/bash-4.4:0/0::gentoo, ebuild scheduled for merge)
    ^^                  ^^^^^^^^^^

  (sys-libs/readline-6.3_p8-r2:0/0::gentoo, installed) pulled in by
    >=sys-libs/readline-4.1:0/0= required by (dev-lang/python-2.7.12:2.7/2.7::gentoo, installed)
                           ^^^^^
    (and 19 more with the same problem)

NOTE: Use the '--verbose-conflicts' option to display parents omitted above

It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously.  If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.

gladiator #