# emerge portage --autounmask-write

Local copy of remote index is up-to-date and will be used.
Calculating dependencies... done!
[binary     U  ] sys-libs/zlib-1.2.11-r2 [1.2.11]
[binary     U  ] app-arch/bzip2-1.0.6-r10 [1.0.6-r8]
[binary  N     ] dev-util/pkgconfig-0.29.2  USE="-hardened -internal-glib" ABI_X86="(64) -32 (-x32)"
[binary  N     ] virtual/pkgconfig-0-r1  ABI_X86="(64) -32 (-x32)"
[ebuild     U ~] sys-libs/readline-7.0_p5 [6.3_p8-r3]
[binary     U  ] sys-libs/gdbm-1.13-r2 [1.11] USE="readline%*"
[binary  NS    ] dev-lang/python-3.6.5 [2.7.12, 3.4.5] USE="gdbm ipv6 ncurses readline sqlite ssl (threads) xml -build -examples -hardened -libressl {-test} -tk -wininst"
[binary  N     ] dev-python/pyblake2-1.1.2  PYTHON_TARGETS="python2_7 python3_6 (-pypy) (-pypy3) -python3_4 -python3_5 (-python3_7)"
[ebuild     U ~] sys-apps/portage-2.3.52-r1 [2.3.6] USE="-gentoo-dev% -rsync-verify%" PYTHON_TARGETS="python3_6* -python3_4* -python3_7%"

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

sys-libs/zlib:0

  (sys-libs/zlib-1.2.11-r2:0/1::gentoo, binary scheduled for merge) pulled in by
    >=sys-libs/zlib-1.1.3:0/1= required by (dev-lang/python-3.6.5:3.6/3.6m::gentoo, binary scheduled for merge)
                         ^^^^^

  (sys-libs/zlib-1.2.11:0/0::gentoo, installed) pulled in by
    >=sys-libs/zlib-1.2.8-r1:0/0=[abi_x86_64(-)] required by (media-libs/tiff-4.0.8:0/0::gentoo, installed)
                            ^^^^^
    >=sys-libs/zlib-1.1.3:0/0= required by (dev-lang/python-2.7.12:2.7/2.7::gentoo, installed)
                         ^^^^^
    sys-libs/zlib:0/0= required by (media-libs/openjpeg-2.1.1_p20160922:2/7::gentoo, installed)
                 ^^^^^
    >=sys-libs/zlib-1.2.8-r1:0/0=[abi_x86_64(-)] required by (media-libs/lcms-2.8-r1:2/2::gentoo, installed)
                            ^^^^^
    >=sys-libs/zlib-1.2.7:0/0= required by (app-text/ghostscript-gpl-9.21:0/0::gentoo, installed)
                         ^^^^^
    >=sys-libs/zlib-1.1.3:0/0= required by (dev-lang/python-3.4.5:3.4/3.4m::gentoo, installed)
                         ^^^^^
    sys-libs/zlib:0/0= required by (media-gfx/imagemagick-6.9.9.0:0/6.9.9.0::gentoo, installed)
                 ^^^^^
    >=sys-libs/zlib-1.2.8-r1:0/0=[abi_x86_64(-)] required by (media-libs/libpng-1.6.29:0/16::gentoo, installed)
                            ^^^^^
    >=sys-libs/zlib-1.2.3:0/0= required by (net-misc/openssh-7.5_p1-r1:0/0::gentoo, installed)
                         ^^^^^
    >=sys-libs/zlib-1.2.8-r1:0/0=[abi_x86_64(-)] required by (dev-libs/libxml2-2.9.4-r1:2/2::gentoo, installed)
                            ^^^^^
    (and 1 more with the same problems)

sys-libs/readline:0

  (sys-libs/readline-7.0_p5:0/7::gentoo, ebuild scheduled for merge) pulled in by
    >=sys-libs/readline-4.1:0/7= required by (dev-lang/python-3.6.5:3.6/3.6m::gentoo, binary scheduled for merge)
                           ^^^^^
    (and 1 more with the same problem)

  (sys-libs/readline-6.3_p8-r3:0/0::gentoo, installed) pulled in by
    sys-libs/readline:0/0= required by (net-fs/samba-4.5.10:0/0::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (dev-lang/ruby-2.2.6:2.2/2.2::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (dev-libs/libxml2-2.9.4-r1:2/2::gentoo, installed)
                     ^^^^^
    >=sys-libs/readline-5.2:0/0= required by (sys-block/parted-3.2:0/0::gentoo, installed)
                           ^^^^^
    >=sys-libs/readline-6.2_p5-r1:0/0=[abi_x86_64(-)] required by (sys-libs/slang-2.3.0:0/0::gentoo, installed)
                                 ^^^^^
    sys-libs/readline:0/0= required by (sys-apps/gawk-4.1.3:0/0::gentoo, installed)
                     ^^^^^
    >=sys-libs/readline-4.1:0/0= required by (dev-lang/python-2.7.12:2.7/2.7::gentoo, installed)
                           ^^^^^
    sys-libs/readline:0/0= required by (dev-libs/libpcre2-10.22:0/0::gentoo, installed)
                     ^^^^^
    >=sys-libs/readline-4.1:0/0= required by (net-misc/ntp-4.2.8_p10-r1:0/0::gentoo, installed)
                           ^^^^^
    >=sys-libs/readline-6.3:0/0= required by (app-shells/bash-4.3_p48-r1:0/0::gentoo, installed)
                           ^^^^^
    sys-libs/readline:0/0= required by (sys-fs/xfsprogs-4.9.0:0/0::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (app-crypt/gnupg-2.1.20-r1:0/0::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (dev-lang/ruby-2.1.9:2.1/2.1::gentoo, installed)
                     ^^^^^
    >=sys-libs/readline-4.1:0/0= required by (dev-lang/python-3.4.5:3.4/3.4m::gentoo, installed)
                           ^^^^^
    sys-libs/readline:0/0= required by (net-dns/bind-tools-9.11.1_p1:0/0::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (sys-apps/util-linux-2.28.2:0/0::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (dev-libs/libpcre-8.40-r1:3/3::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0= required by (dev-db/postgresql-9.6.3-r1:9.6/9.6::gentoo, installed)
                     ^^^^^
    sys-libs/readline:0/0=[abi_x86_64(-)] required by (dev-db/sqlite-3.19.3:3/3::gentoo, installed)
                     ^^^^^
    (and 4 more with the same problems)

sys-apps/portage:0

  (sys-apps/portage-2.3.52-r1:0/0::gentoo, ebuild scheduled for merge) pulled in by
    sys-apps/portage (Argument)

  (sys-apps/portage-2.3.6:0/0::gentoo, installed) pulled in by
    >=sys-apps/portage-2.2.16[python_targets_python2_7(-),python_targets_python3_4(-),-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-)] required by (app-portage/layman-2.4.2:0/0::gentoo, installed)
                                                                                                                                                                
    sys-apps/portage[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-)] required by (app-portage/gentoolkit-0.3.3:0/0::gentoo, installed)
                                                                                                                                                                                                                                                                                                                                

app-arch/bzip2:0

  (app-arch/bzip2-1.0.6-r10:0/1::gentoo, binary scheduled for merge) pulled in by
    app-arch/bzip2:0/1= required by (dev-lang/python-3.6.5:3.6/3.6m::gentoo, binary scheduled for merge)
                  ^^^^^

  (app-arch/bzip2-1.0.6-r8:0/0::gentoo, installed) pulled in by
    app-arch/bzip2:0/0= required by (dev-lang/python-2.7.12:2.7/2.7::gentoo, installed)
                  ^^^^^
    app-arch/bzip2:0/0= required by (dev-lang/python-3.4.5:3.4/3.4m::gentoo, installed)
                  ^^^^^

sys-libs/gdbm:0

  (sys-libs/gdbm-1.13-r2:0/1.13::gentoo, binary scheduled for merge) pulled in by
    sys-libs/gdbm:0/1.13=[berkdb] required by (dev-lang/python-3.6.5:3.6/3.6m::gentoo, binary scheduled for merge)
                 ^^^^^^^^

  (sys-libs/gdbm-1.11:0/0::gentoo, installed) pulled in by
    sys-libs/gdbm:0/0=[berkdb] required by (dev-lang/python-2.7.12:2.7/2.7::gentoo, installed)
                 ^^^^^
    sys-libs/gdbm:0/0=[berkdb] required by (dev-lang/python-3.4.5:3.4/3.4m::gentoo, installed)
                 ^^^^^

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

!!! The slot conflict(s) shown above involve package(s) which may need to
!!! be rebuilt in order to solve the conflict(s). However, the following
!!! package(s) cannot be rebuilt for the reason(s) shown:

  (sys-libs/slang-2.3.0:0/0::gentoo, installed): ebuild is masked or unavailable
  (sys-apps/gawk-4.1.3:0/0::gentoo, installed): ebuild is masked or unavailable
  (media-libs/libpng-1.6.29:0/16::gentoo, installed): ebuild is masked or unavailable
  (app-crypt/gnupg-2.1.20-r1:0/0::gentoo, installed): ebuild is masked or unavailable
  (dev-lang/python-2.7.12:2.7/2.7::gentoo, installed): ebuild is masked or unavailable
  (dev-db/postgresql-9.6.3-r1:9.6/9.6::gentoo, installed): ebuild is masked or unavailable
  (media-libs/tiff-4.0.8:0/0::gentoo, installed): ebuild is masked or unavailable
  (dev-lang/ruby-2.1.9:2.1/2.1::gentoo, installed): ebuild is masked or unavailable
  (sys-apps/util-linux-2.28.2:0/0::gentoo, installed): ebuild is masked or unavailable
  (dev-libs/libpcre2-10.22:0/0::gentoo, installed): ebuild is masked or unavailable
  (dev-lang/ruby-2.2.6:2.2/2.2::gentoo, installed): ebuild is masked or unavailable
  (dev-lang/python-3.4.5:3.4/3.4m::gentoo, installed): ebuild is masked or unavailable
  (net-misc/ntp-4.2.8_p10-r1:0/0::gentoo, installed): ebuild is masked or unavailable
  (dev-libs/libpcre-8.40-r1:3/3::gentoo, installed): ebuild is masked or unavailable
  (sys-fs/xfsprogs-4.9.0:0/0::gentoo, installed): ebuild is masked or unavailable
  (app-shells/bash-4.3_p48-r1:0/0::gentoo, installed): ebuild is masked or unavailable
  (app-text/ghostscript-gpl-9.21:0/0::gentoo, installed): ebuild is masked or unavailable
  (net-dns/bind-tools-9.11.1_p1:0/0::gentoo, installed): ebuild is masked or unavailable
  (net-misc/openssh-7.5_p1-r1:0/0::gentoo, installed): ebuild is masked or unavailable
  (media-libs/lcms-2.8-r1:2/2::gentoo, installed): ebuild is masked or unavailable
  (dev-db/sqlite-3.19.3:3/3::gentoo, installed): ebuild is masked or unavailable
  (media-gfx/imagemagick-6.9.9.0:0/6.9.9.0::gentoo, installed): ebuild is masked or unavailable
  (net-fs/samba-4.5.10:0/0::gentoo, installed): ebuild is masked or unavailable
  (media-libs/openjpeg-2.1.1_p20160922:2/7::gentoo, installed): ebuild is masked or unavailable
  (dev-libs/libxml2-2.9.4-r1:2/2::gentoo, installed): ebuild is masked or unavailable
  (sys-block/parted-3.2:0/0::gentoo, installed): ebuild is masked or unavailable


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.