Created attachment 474602 [details, diff] selenium-3.4.2.ebuild.patch 3.4.2 is availalbe: https://pypi.python.org/pypi/selenium To work it requires https://github.com/mozilla/geckodriver/releases. While there exist ebuild for source version: https://github.com/gentoo/gentoo-rust/tree/master/www-apps/geckodriver I think it's much easier to start with binary version, which works here. Patch for the the ebuild and geckodriver-bin follows.
Created attachment 474604 [details] geckodriver-bin-0.16.1.ebuild
CC'ing @cynede - as far as I understand you maintain geckodriver source version at gentoo-rust overlay. So you could be interested in this bump.
Hi! v3.13.0 is now available in the tree.