~amd64 no-multilib. Portage is trying to replace sys-fs/udev with sys-fs/eudev. Masking does not help. Reproducible: Always
Created attachment 332026 [details] Portage log
Created attachment 332028 [details] emerge --info
Just a guess: have virtual/udev and sys-fs/udev the same use flags enabled? Afair, they have to be the same.
Actually virtual/udev ebuilds are broken. They forgot to add '|| ()', so it tries to install both udev & eudev
Fixed in CVS. Next --sync should fix things again. Thank you for flying Air Gentoo!
*** Bug 446838 has been marked as a duplicate of this bug. ***
*** Bug 446886 has been marked as a duplicate of this bug. ***
*** Bug 446846 has been marked as a duplicate of this bug. ***
*** Bug 446844 has been marked as a duplicate of this bug. ***
*** Bug 446694 has been marked as a duplicate of this bug. ***