MyPaint fails due to conflicts

Calculating dependencies... done!
[ebuild  N     ] dev-python/namespace-google-1::python-kit  PYTHON_TARGETS="python2_7 python3_4 -pypy -python3_5 -python3_6" 0 KiB
[ebuild  N     ] dev-python/protobuf-python-3.4.1:0/14::python-kit  PYTHON_TARGETS="python2_7 python3_4 -python3_5 -python3_6" 0 KiB
[ebuild     UD ] dev-libs/protobuf-3.3.0:0/13::dev-kit [3.4.1:0/14::dev-kit] USE="python%* zlib -emacs -examples -java% -static-libs {-test}" ABI_X
86="32 (64) (-x32)" PYTHON_TARGETS="python2_7%* python3_4%* -python3_5% -python3_6%" 4,235 KiB
[ebuild  N     ] media-gfx/mypaint-1.2.1::media-kit  LINGUAS="en_GB -cs -de -en_CA -es -fr -hu -id -it -ja -ko -nb -nn_NO -pl -pt_BR -ro -ru -sl -s
v -uk -zh_CN -zh_TW" PYTHON_TARGETS="python2_7" 37,009 KiB

Total: 4 packages (1 downgrade, 3 new), Size of downloads: 41,244 KiB

Oops! Conflicts have been encountered:

>>> media-gfx/mypaint-1.2.1:0/0::media-kit, ebuild scheduled for merge, wants dev-libs/protobuf[python]
>>> media-sound/clementine-1.3.1-r5:0/0::media-kit, installed, wants dev-libs/protobuf:0/14=
>>> dev-qt/qtwebengine-5.9.2:5/5.9::kde-kit, installed, wants dev-libs/protobuf:0/14=
>>> dev-python/protobuf-python-3.4.1:0/14::python-kit, ebuild scheduled for merge, wants ~dev-libs/protobuf-3.4.1

My candidates are:

>>> dev-libs/protobuf-3.3.0:0/13::dev-kit, ebuild scheduled for merge has SLOT 0/13
>>> dev-libs/protobuf-3.4.1:0/14::dev-kit, installed has SLOT 0/14