[ebuild   R   ] dev-libs/libxml2-2.9.4  USE="icu* ipv6 python readline -debug -examples -lzma -static-libs {-test}" ABI_X86="(64) -32 (-x32)" PYTHON_TARGETS="python2_7 python3_4 (-python3_3) (-python3_5)"
[ebuild   R   ] media-libs/harfbuzz-1.3.1  USE="cairo glib graphite icu* introspection truetype -fontconfig -static-libs {-test}" ABI_X86="(64) -32 (-x32)"
[ebuild  N    ] www-client/chromium-54.0.2840.59  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"

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by www-client/chromium-54.0.2840.59::gentoo
# required by =www-client/chromium-54.0.2840.59::gentoo (argument)
>=media-libs/harfbuzz-1.3.1 icu
# required by www-client/chromium-54.0.2840.59::gentoo
# required by =www-client/chromium-54.0.2840.59::gentoo (argument)
>=dev-libs/libxml2-2.9.4 icu