Can't update world

After long time I decided to update whole system but received next errors:

emerge -auDN @world

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

dev-libs/icu:0

  (dev-libs/icu-51.1::gentoo, ebuild scheduled for merge) pulled in by
    dev-libs/icu:0/51.1= required by (media-libs/libcdr-0.0.14::gentoo, installed)
    dev-libs/icu:0/51.1= required by (media-libs/harfbuzz-0.9.12::gentoo, installed)
    dev-libs/icu:0/51.1= required by (app-text/libmspub-0.0.6::gentoo, installed)
    dev-libs/icu:0/51.1= required by (sys-apps/gptfdisk-0.8.6::gentoo, installed)

  (dev-libs/icu-51.2-r1::gentoo, installed) pulled in by
    dev-libs/icu:0/51.2= required by (media-libs/raptor-2.0.9::gentoo, installed)
    dev-libs/icu:0/51.2= required by (media-libs/libvisio-0.0.30::gentoo, binary scheduled for merge)
    >=dev-libs/icu-49.1.1-r1:0/51.2= required by (www-client/chromium-30.0.1599.101::gentoo, installed)
    dev-libs/icu:0/51.2= required by (dev-libs/libxml2-2.9.1-r1::gentoo, binary scheduled for merge)
    dev-libs/icu:0/51.2= required by (dev-qt/qtwebkit-4.8.5::gentoo, binary scheduled for merge)
    (and 1 more with the same problems)

dev-qt/qtgui:4

  (dev-qt/qtgui-4.8.5-r1::gentoo, binary scheduled for merge) pulled in by
    >=dev-qt/qtgui-4.8.5:4[accessibility,dbus(+)] required by (kde-base/kdepim-runtime-4.11.3::gentoo, binary scheduled for merge)
    ~dev-qt/qtgui-4.8.5[accessibility,-aqua,-debug,qt3support] required by (dev-qt/qtdeclarative-4.8.5::gentoo, binary scheduled for merge)
    (and 183 more with the same problems)

  (dev-qt/qtgui-4.8.4-r1::gentoo, installed) pulled in by
    >=dev-qt/qtgui-4.8.0:4[accessibility,dbus] required by (kde-misc/kde-gtk-config-2.2.1::gentoo, binary scheduled for merge)
    >=dev-qt/qtgui-4.8.0:4[accessibility,dbus] required by (kde-base/kdesdk-scripts-4.10.5::gentoo, binary scheduled for merge)
    >=dev-qt/qtgui-4.8.0:4[accessibility,dbus] required by (kde-base/kdegraphics-strigi-analyzer-4.10.5::gentoo, binary scheduled for merge)
    >=dev-qt/qtgui-4.8.0:4[accessibility,dbus] required by (kde-base/solid-4.10.5::gentoo, binary scheduled for merge)
    >=dev-qt/qtgui-4.8.0:4[accessibility,dbus] required by (kde-base/kdepim-strigi-analyzer-4.10.5::gentoo, binary scheduled for merge)
    ~dev-qt/qtgui-4.8.4[accessibility=,aqua=,debug=,qt3support] required by (dev-qt/qt3support-4.8.4::gentoo, installed)
    (and 1 more with the same problems)

dev-qt/qtcore:4

  (dev-qt/qtcore-4.8.4-r5::gentoo, ebuild scheduled for merge) pulled in by
    ~dev-qt/qtcore-4.8.4[aqua=,debug=] required by (dev-qt/qtdbus-4.8.4::gentoo, installed)
    (and 4 more with the same problem)

  (dev-qt/qtcore-4.8.5::gentoo, binary scheduled for merge) pulled in by
    ~dev-qt/qtcore-4.8.5[-aqua,-debug] required by (dev-qt/qtsvg-4.8.5::gentoo, binary scheduled for merge)
    (and 12 more with the same problem)

dev-qt/qtscript:4

  (dev-qt/qtscript-4.8.5::gentoo, binary scheduled for merge) pulled in by
    ~dev-qt/qtscript-4.8.5[-aqua,-debug] required by (dev-qt/qtgui-4.8.5-r1::gentoo, binary scheduled for merge)
    (and 2 more with the same problem)

  (dev-qt/qtscript-4.8.4::gentoo, installed) pulled in by
    ~dev-qt/qtscript-4.8.4[aqua=,debug=] required by (dev-qt/qtgui-4.8.4-r1::gentoo, installed)

dev-qt/qtdbus:4

  (dev-qt/qtdbus-4.8.5::gentoo, binary scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-qt/qtdbus-4.8.4::gentoo, installed) pulled in by
    ~dev-qt/qtdbus-4.8.4[aqua=,debug=] required by (dev-qt/qtgui-4.8.4-r1::gentoo, installed)

dev-qt/qt3support:4

  (dev-qt/qt3support-4.8.5::gentoo, binary scheduled for merge) pulled in by
    ~dev-qt/qt3support-4.8.5[-aqua,-debug] required by (dev-qt/qtgui-4.8.5-r1::gentoo, binary scheduled for merge)
    (and 2 more with the same problem)

  (dev-qt/qt3support-4.8.4::gentoo, installed) pulled in by
    ~dev-qt/qt3support-4.8.4[aqua=,debug=] required by (dev-qt/qtgui-4.8.4-r1::gentoo, installed)

dev-qt/qtsql:4

  (dev-qt/qtsql-4.8.5::gentoo, binary scheduled for merge) pulled in by
    ~dev-qt/qtsql-4.8.5[-aqua,-debug,qt3support] required by (dev-qt/qt3support-4.8.5::gentoo, binary scheduled for merge)
    (and 1 more with the same problem)

  (dev-qt/qtsql-4.8.4::gentoo, installed) pulled in by
    ~dev-qt/qtsql-4.8.4[aqua=,debug=,qt3support] required by (dev-qt/qt3support-4.8.4::gentoo, installed)


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.

I’ve tried to run with “–backtrack=30” but didn’t help.

Additional information:

cat /etc/portage/package.keywords/custom 

=www-client/google-chrome-30.0.1599.47_beta1 ~amd64
app-emulation/virtualbox ~amd64
=app-emulation/virtualbox-additions-4.3.2 ~amd64
=app-emulation/virtualbox-modules-4.3.2 ~amd64
media-libs/fontconfig-infinality ~amd64
app-admin/eselect-lcdfilter ~amd64
app-admin/eselect-infinality ~amd64
media-libs/fontconfig ~amd64
media-libs/freetype ~amd64
x11-libs/cairo ~amd64
x11-libs/libXft ~amd64
=dev-perl/Net-ARP-1.0.6 ~amd64
=net-misc/teamviewer-8.0.20931 ~amd64

make.conf

ACCEPT_LICENSE="*"
source /var/lib/layman/make.conf
MAKEOPTS="-j5"
PORTDIR="/usr/portage"

How to resolve this dependencies?Where is the start point?

Thanks!

Try before update the world

emerge -a1 dev-libs/icu:0 dev-qt/qtgui:4 dev-qt/qtcore:4 dev-qt/qtscript:4 dev-qt/qtdbus:4 dev-qt/qt3support:4 dev-qt/qtsql:4