This bug tracks the implementation of the EAPI 4 feature mentioned in the summary.
This is in git now: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=65c1a6e0dddf0d99af7adbd41484150d5fc6ef9c
this is the correct commit: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=1e17e55e2cc40cf44be9e013720af512cc825dcd + the some of the commits before this one
*** Bug 251179 has been marked as a duplicate of this bug. ***