wxGTK-3.0.1 is not part of the official tree, but it can not hurt to add >=3.0.1 as minimum as suggested in http://kicad-pcb.org/help/known-system-related-issues/
Fixed in PR: https://github.com/gentoo/gentoo/pull/4531 Once that is landed I'll likely drop kicad-4.0.5 in favour of kicad-4.0.6 in aforementioned PR.
I suggest to keep 4.0.5 for some while. It can help others who need the same version in a team.
Okay, I will backport the updates from the 4.0.6 ebuild and keep this one around too.
Backported ebuild updates from 4.0.6, so I can keep this around. PR: https://github.com/gentoo/gentoo/pull/4531