New dependency with a new configure option the ebuild will need to explicitly toggle: http://cgit.freedesktop.org/systemd/systemd/commit/?id=8d4e028f1868c47864ec873d9f30c3ee961a8849 There isn't a version specific check (yet) but the minimum is >=dev-libs/elfutils-0.158 For my purposes I've just added --disable-elfutils but for Gentoo adding a use flag seems reasonable. https://github.com/coreos/coreos-overlay/commit/0a2c8cbaaa396ae75c3d021a4ebc00f3fe1c989d
This was fixed at some point. Thanks for the report.