The ebuild installs appdata-rng-init.el in /usr/share/emacs/site-lisp/site-start.d/ which is not according to emacs team policy (and which means that the file cannot be found by Emacs). Installation of the file should either be a) suppressed, or b) the ebuild should be changed to use elisp-common.eclass. (I could provide a patch for b) if needed.)
Feel free to fix this as it fits.
(In reply to Lars Wendler (Polynomial-C) from comment #1) > Feel free to fix this as it fits. Nice one. So the plans to convert this to a metapackage were not known a week ago? Good that I haven't spent any time on this yet. :-/