Created attachment 367912 [details, diff] add ~x64-macos to ccze Dynamic libraries are handled differently on OS X, The attached patch to the ebuild allows gentoo-prefix to build ccze successful. I've tested it colorizing log files and it works fine.
Thanks for your contribution. I think your patch is ok, would've been slightly simpler using -bundle. Since this bug got ignored for such a long time, I won't apply the patch, for I don't know if there is interest for the package at this point.