Calculating dependencies... done! [binary N ] dev-libs/re2-0.2016.05.01:0/0.2016.05.01::gentoo USE="-icu" ABI_X86="(64) -32 (-x32)" 443 KiB [binary N ] dev-perl/JSON-2.900.0::gentoo USE=«{-test}» 87 KiB [binary N ] dev-python/beautifulsoup-3.2.1-r1:python-2::gentoo PYTHON_TARGETS=«python2_7 (-pypy)» 93 KiB [binary N ] dev-python/html5lib-0.9999999::gentoo USE=«{-test}» PYTHON_TARGETS=«python2_7 python3_4 (-pypy) (-pypy3) (-python3_5)» 521 KiB [binary N ] dev-python/simplejson-3.10.0::gentoo PYTHON_TARGETS=«python2_7 python3_4 (-pypy) (-pypy3) (-python3_5)» 235 KiB [binary N ] dev-python/markupsafe-0.23::gentoo PYTHON_TARGETS=«python2_7 python3_4 (-pypy) (-pypy3) (-python3_5)» 77 KiB [binary N ] dev-python/beautifulsoup-4.5.1:4::gentoo USE="-doc {-test}" PYTHON_TARGETS=«python2_7 python3_4 (-pypy) (-pypy3) (-python3_5)» 341 KiB [binary N ] dev-python/jinja-2.8::gentoo USE="-doc -examples" PYTHON_TARGETS=«python2_7 python3_4 (-pypy) (-pypy3) (-python3_5)» 804 KiB [binary U ] media-libs/libwebp-0.5.2:0/6::gentoo [0.4.2:0/5::gentoo] USE=«gif jpeg opengl png tiff -experimental (-neon) -static-libs -swap-16bit-csp» ABI_X86=«32 (64) (-x32)» CPU_FLAGS_X86=«avx2%* sse2%* sse4_1%*» 730 KiB [binary N ] www-client/chromium-55.0.2883.75::gentoo USE=«cups (gn) hangouts (pic) proprietary-codecs pulseaudio suid system-ffmpeg tcmalloc -custom-cflags -gnome -gnome-keyring (-gtk3) -kerberos (-neon) (-selinux) {-test} -widevine» L10N=«am ar bg bn ca cs da de el en-GB es es-419 et fa fi fil fr gu he hi hr hu id it ja kn ko lt lv ml mr ms nb nl pl pt-BR pt-PT ro ru sk sl sr sv sw ta te th tr uk vi zh-CN zh-TW» 62784 KiB
Total: 10 packages (1 upgrade, 9 new, 10 binaries), Size of downloads: 66111 KiB
!!! Multiple package instances within a single package slot have been pulled !!! into the dependency graph, resulting in a slot conflict:
media-libs/libwebp:0
(media-libs/libwebp-0.5.2:0/6::gentoo, binary scheduled for merge) pulled in by >=media-libs/libwebp-0.4.0:0/6= required by (www-client/chromium-55.0.2883.75:0/0::gentoo, binary scheduled for merge) ^^^^^
(media-libs/libwebp-0.4.2:0/5::gentoo, installed) pulled in by media-libs/libwebp:0/5= required by (dev-python/pillow-3.4.2-r1:0/0::gentoo, installed) ^^^^^ (and 4 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.