oxygen-icons issue is included in this bug report: KDE: a several cases to resolve.
Quote from end of bug reports first paragraph is your issue:
A side effect of this is that kde-frameworks move occured but ebuilds prefer kde-apps/oxygen-icons dependency at same time and giving file collision between kde-apps/oxygen-icons and kde-frameworks/oxygen-icons. build.log attached.
Login and vote/watch the report to keep updated by email.
