Chromium fails while compiling ninja see below:

ninja: build stopped: subcommand failed.
^[[31;01m*[[0m ERROR: www-client/chromium-66.0.3359.170::net-kit failed (compile phase):
^[[31;01m*[[0m ninja -v -j5 -l0 -C out/Release v8_context_snapshot_generator failed
^[[31;01m*[[0m~
^[[31;01m*[[0m Call stack:
^[[31;01m*[[0m ebuild.sh, line 92: Called src_compile
^[[31;01m*[[0m environment, line 5286: Called eninja '-C' 'out/Release' 'v8_context_snapshot_generator'
^[[31;01m*[[0m environment, line 1839: Called die
^[[31;01m*[[0m The specific snippet of code:
^[[31;01m*[[0m "$@" || die "${nonfatal_args[@]}" "${*} failed"
^[[31;01m*[[0m~
^[[31;01m*[[0m If you need support, post the output of `emerge --info '=www-client/chromium-66.0.3359.170::net-kit'`,
^[[31;01m*[[0m the complete build log and the output of `emerge -pqv '=www-client/chromium-66.0.3359.170::net-kit'`.
^[[32;01m*[[0m~
^[[32;01m*[[0m MemTotal: 15355924 kB
^[[32;01m*[[0m SwapTotal: 16777212 kB
^[[32;01m*[[0m~
^[[31;01m*[[0m The complete build log is located at '/var/tmp/portage/www-client/chromium-66.0.3359.170/temp/build.log'.
^[[31;01m*[[0m The ebuild environment file is located at '/var/tmp/portage/www-client/chromium-66.0.3359.170/temp/environment'.
^[[31;01m*[[0m Working directory: '/var/tmp/portage/www-client/chromium-66.0.3359.170/work/chromium-66.0.3359.170'
^[[31;01m*[[0m S: '/var/tmp/portage/www-client/chromium-66.0.3359.170/work/chromium-66.0.3359.170'