nonfatal dodoc 00-RELEASENOTES BUGS CONTRIBUTING MANIFESTO README This is incorrect. Nonfatal is meant to allow you to provide custom error handling, not ignore errors in poorly written ebuilds. Provide the correct file list instead.
Work in progress ebuild that fixes this (among other things) can be found here: https://github.com/gentoo/gentoo-portage-rsync-mirror/pull/120
fixed in all ebuilds, cheers !