I'm upgrading an older system (maybe 4-months old). and getting an error 
running 
emerge --oneshot portage

emerge --oneshot portage
Calculating dependencies... done!
[ebuild  rR    ] app-arch/bzip2-1.0.6-r8 [1.0.6-r8]
[ebuild     U  ] sys-devel/automake-1.15.1-r2 [1.15-r2] USE="{-test%}" 
[ebuild  r  U  ] sys-libs/zlib-1.2.11-r1 [1.2.11]
[ebuild  r  U  ] media-libs/libpng-1.6.29 [1.6.27] CPU_FLAGS_X86="sse%*" 
[ebuild  rR    ] x11-libs/libpciaccess-0.13.4 
[ebuild  rR    ] media-libs/id3lib-3.8.3-r8 
[ebuild  rR    ] media-libs/libpng-1.2.57 
[ebuild  r  U  ] dev-lang/python-2.7.14-r1 [2.7.12] USE="sqlite*" 
[ebuild  r  U  ] dev-lang/python-3.4.5-r1 [3.4.5] USE="{-test%}" 
[ebuild  NS    ] dev-lang/python-3.5.4-r1 [2.7.12, 3.4.5] USE="gdbm ipv6 
ncurses readline ssl (threads) xml -build -examples -hardened -libressl -sqlite 
{-test} -tk -wininst" 
[ebuild  rR    ] dev-libs/liborcus-0.12.1  PYTHON_SINGLE_TARGET="python3_5* 
-python3_4*" PYTHON_TARGETS="python3_5* -python3_4*" 
[ebuild  r  U  ] dev-libs/libxml2-2.9.7 [2.9.4-r1] PYTHON_TARGETS="python3_5* 
-python3_4* -python3_6%" 
[ebuild  N     ] dev-python/pyblake2-1.1.0  PYTHON_TARGETS="python2_7 python3_5 
(-pypy) -python3_4 -python3_6" 
[ebuild  rR    ] net-libs/neon-0.30.2 
[ebuild     U ~] sys-apps/portage-2.3.16 [2.3.6] PYTHON_TARGETS="python3_5* 
-python3_4*" 
[ebuild  rR    ] sys-devel/llvm-3.9.1-r1 
[ebuild  r  U  ] dev-db/mysql-5.6.39 [5.6.35] USE="-numa%" 
[ebuild  rR    ] net-libs/serf-1.3.8 
[ebuild  r  U  ] media-libs/openjpeg-2.3.0 [2.1.1_p20160922]
[ebuild  r  U  ] media-gfx/imagemagick-7.0.7.19 [6.9.8.6]
[ebuild  rR    ] app-text/ghostscript-gpl-9.21 
[ebuild  r  U  ] net-misc/openssh-7.5_p1-r4 [7.5_p1-r1]
[ebuild  r  U  ] sys-auth/consolekit-1.2.0 [1.1.0-r1] USE="udev%* -evdev%" 
[ebuild  r  U  ] app-text/evince-3.24.2 [3.22.1]

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

sys-apps/portage:0

  (sys-apps/portage-2.3.16:0/0::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[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)
                                                                                
                                                                                
                                                                                
                                                                                
                              
    
sys-apps/portage[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (app-admin/webapp-config-1.55:0/0::gentoo, installed)
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
              
    
sys-apps/portage[python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (dev-java/java-config-2.2.0-r3:2/2::gentoo, installed)
                                                                                
                                                                                
                                                                                
                                                                                
                                         
    
sys-apps/portage[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (app-portage/layman-2.4.2:0/0::gentoo, installed)
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
          

sys-libs/zlib:0

  (sys-libs/zlib-1.2.11-r1:0/1::gentoo, ebuild scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (sys-libs/zlib-1.2.11:0/0::gentoo, installed) pulled in by
    >=sys-libs/zlib-1.2.8-r1:0/0=[abi_x86_32(-),abi_x86_64(-)] required by 
(media-libs/lcms-2.8-r1:2/2::gentoo, installed)
                            ^^^^^                                               
                                                                              
    >=sys-libs/zlib-1.2.8-r1:0/0=[abi_x86_32(-),abi_x86_64(-)] required by 
(media-libs/tiff-4.0.6:0/0::gentoo, installed)
                            ^^^^^                                               
                                                                             


!!! 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:

  (media-libs/tiff-4.0.6:0/0::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.

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


The following packages are causing rebuilds:

  (sys-libs/zlib-1.2.11-r1:0/1::gentoo, ebuild scheduled for merge) causes 
rebuilds for:
    (net-libs/neon-0.30.2:0/27::gentoo, ebuild scheduled for merge)
    (dev-db/mysql-5.6.39:0/18::gentoo, ebuild scheduled for merge)
    (dev-libs/libxml2-2.9.7:2/2::gentoo, ebuild scheduled for merge)
    (app-text/ghostscript-gpl-9.21:0/0::gentoo, ebuild scheduled for merge)
    (media-libs/openjpeg-2.3.0:2/7::gentoo, ebuild scheduled for merge)
    (media-libs/libpng-1.6.29:0/16::gentoo, ebuild scheduled for merge)
    (sys-auth/consolekit-1.2.0:0/0::gentoo, ebuild scheduled for merge)
    (net-libs/serf-1.3.8:1/1::gentoo, ebuild scheduled for merge)
    (net-misc/openssh-7.5_p1-r4:0/0::gentoo, ebuild scheduled for merge)
    (dev-libs/liborcus-0.12.1:0/0.12::gentoo, ebuild scheduled for merge)
    (media-libs/id3lib-3.8.3-r8:0/0::gentoo, ebuild scheduled for merge)
    (dev-lang/python-3.4.5-r1:3.4/3.4m::gentoo, ebuild scheduled for merge)
    (x11-libs/libpciaccess-0.13.4:0/0::gentoo, ebuild scheduled for merge)
    (media-gfx/imagemagick-7.0.7.19:0/7.0.7.19::gentoo, ebuild scheduled for 
merge)
    (app-text/evince-3.24.2:0/evd3.4-evv3.3::gentoo, ebuild scheduled for merge)
    (sys-devel/llvm-3.9.1-r1:0/3.9.1::gentoo, ebuild scheduled for merge)
    (dev-lang/python-2.7.14-r1:2.7/2.7::gentoo, ebuild scheduled for merge)
    (media-libs/libpng-1.2.57:1.2/1.2::gentoo, ebuild scheduled for merge)
  (app-arch/bzip2-1.0.6-r8:0/1::gentoo, ebuild scheduled for merge) causes 
rebuilds for:
    (dev-lang/python-2.7.14-r1:2.7/2.7::gentoo, ebuild scheduled for merge)
    (dev-lang/python-3.4.5-r1:3.4/3.4m::gentoo, ebuild scheduled for merge)

The following keyword changes are necessary to proceed:
 (see "package.accept_keywords" in the portage(5) man page for more details)
# required by portage (argument)
=sys-apps/portage-2.3.16 ~amd64

----------------------------
emerge --info
Portage 2.3.6 (python 3.4.5-final-0, default/linux/amd64/17.0/desktop, 
gcc-6.4.0, glibc-2.23-r4, 4.9.6-gentoo-r1 x86_64)
=================================================================
System uname: 
Linux-4.9.6-gentoo-r1-x86_64-AMD_FX-tm-8150_Eight-Core_Processor-with-gentoo-2.3
KiB Mem:    16414204 total,   4539752 free
KiB Swap:    8757244 total,   8598852 free
Timestamp of repository gentoo: Tue, 13 Mar 2018 17:00:01 +0000
sh bash 4.3_p48-r1
ld GNU ld (Gentoo 2.28 p1.2) 2.28
app-shells/bash:          4.3_p48-r1::gentoo
dev-java/java-config:     2.2.0-r3::gentoo
dev-lang/perl:            5.24.1-r2::gentoo
dev-lang/python:          2.7.12::gentoo, 3.4.5::gentoo
dev-util/cmake:           3.7.2::gentoo
dev-util/pkgconfig:       0.28-r2::gentoo
sys-apps/baselayout:      2.3::gentoo
sys-apps/openrc:          0.26.3::gentoo
sys-apps/sandbox:         2.10-r3::gentoo
sys-devel/autoconf:       2.13::gentoo, 2.69::gentoo
sys-devel/automake:       1.11.6-r1::gentoo, 1.15-r2::gentoo
sys-devel/binutils:       2.28-r2::gentoo
sys-devel/gcc:            4.5.4::gentoo, 4.9.4::gentoo, 5.4.0-r3::gentoo, 
6.4.0-r1::gentoo
sys-devel/gcc-config:     1.7.3::gentoo
sys-devel/libtool:        2.4.6-r3::gentoo
sys-devel/make:           4.2.1::gentoo
sys-kernel/linux-headers: 4.4::gentoo (virtual/os-headers)
sys-libs/glibc:           2.23-r4::gentoo
Repositories:

gentoo
    location: /usr/portage
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000

brother-overlay
    location: /var/lib/layman/brother-overlay
    sync-type: git
    sync-uri: https://github.com/stefan-langenmaier/brother-overlay.git
    masters: gentoo
    priority: 50

Local
    location: /usr/local/portage
    masters: gentoo
    priority: 99999999

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA googleearth PUEL dlj-1.1 Oracle-BCLA-JavaSE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/lib64/fax /usr/lib64/libreoffice/program/sofficerc 
/usr/share/easy-rsa /usr/share/gnupg/qualified.txt /var/spool/fax/etc"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d 
/etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release 
/etc/php/apache2-php5.6/ext-active/ /etc/php/cgi-php5.6/ext-active/ 
/etc/php/cli-php5.6/ext-active/ /etc/revdep-rebuild /etc/sandbox.d 
/etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d 
/etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--autounmask-write=y --keep-going --with-bdeps=y"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified 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://mirror.csclub.uwaterloo.ca/gentoo-distfiles/ 
http://gentoo.osuosl.org/ ftp://mirror.csclub.uwaterloo.ca/gentoo-distfiles/ 
http://linux.rz.ruhr-uni-bochum.de/download/gentoo-mirror/ 
ftp://linux.rz.ruhr-uni-bochum.de/gentoo-mirror/ 
ftp://ftp.spline.inf.fu-berlin.de/mirrors/gentoo/ 
http://ftp.spline.inf.fu-berlin.de/mirrors/gentoo/";
LANG="en_US.UTF-8"
LC_ALL="en_US.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j8 --load-average=8"
PKGDIR="/usr/portage/packages"
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 acpi alsa amd64 apache2 bluetooth branding bzip2 cairo cdda cdr 
cgi cleartype cli consolekit consolkit corefonts crypt cups cxx dbus dri dts 
dvd dvdr emboss encode exif fam flac foomaticdb fortran gdbm gif gimp gimpprint 
glamor gpm gtk iconv ipv6 java jpeg kpathsea lcms ldap libnotify lock mad mng 
modules mp3 mp4 mpeg multilib mysql ncurses nls nptl ogg opengl openmp pam 
pango pcre pdf png policykit ppds qt3support qt5 readline scanner sdl seccomp 
session spell ssl startup-notification svg tcpd tetexspell thunar tiff truetype 
type1 udev udisks unicode upower usb vorbis wxwidgets x264 xattr xcb xml xv 
xvid zlib" ABI_X86="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" CALLIGRA_FEATURES="kexi words flow plan sheets stage 
tables krita karbon braindump author" COLLECTD_PLUGINS="df interface irq load 
memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx fma4 mmx mmxext popcnt sse 
sse2 sse3 sse4_1 sse4_2 sse4a ssse3 xop" ELIBC="glibc" GPSD_PROTOCOLS="ashtech 
aivdm earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 
nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq 
superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev" 
KERNEL="linux" L10N="en" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 
lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console 
presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6" 
POSTGRES_TARGETS="postgres9_5" PYTHON_SINGLE_TARGET="python3_5" 
PYTHON_TARGETS="python2_7 python3_5" RUBY_TARGETS="ruby22 ruby23" 
SANE_BACKENDS="epson2 fujitsu" USERLAND="GNU" VIDEO_CARDS="nvidia nouveau" 
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, INSTALL_MASK, LINGUAS, 
PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, 
PORTAGE_RSYNC_EXTRA_OPTS


-- 
Thelma

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