On gentoo `Portage log wiki' pages one is told: "In order to create per-category elog files, enable the split-elog Portage feature."
(If you want to create `category-based' subdir.) It never gets around to explaining how split-elog is enabled. There is no example in /usr/share/portage/config/make.conf.example Can anyone post an example of how and where this is done?