The Manifest file for zsh contains listings for backup files like zprofile.bak that don't exist. This causes "emerge zsh" to fail: !!! A file listed in the Manifest could not be found: /usr/portage/app-shells/zsh/files/zprofile.bak I think the dev just needs to create a new Manifest after the backup files have been erased. Reproducible: Always Here is the post on the forums where I found out about this problem: http://forums.gentoo.org/viewtopic-p-4034390.html
This has already been fixed. Please resync. Thanks for reporting.