Although unmerging of media-fonts/font-adobe-100dpi says * Checking /usr/share/fonts/100dpi for useless files ... and even if /usr/share/fonts/100dpi contains only "fonts.alias" (from media-font/fonts-alias), it leaves in that directory the files fonts.cache-1 encodings.dir fonts.dir The problem with this is that it causes segfaults. I observed it with auctex: If auctex is installed and emacs is called emacs -fn -adobe-courier-medium-r-normal--18-180-75-75-m-110-iso10646-1 then viewing of a Tex-File with a superscript within a \subsection, e.g. in the minimal example \documentclass{article} \begin{document} \subsection{$x^2$} \end{document} causes auctex/emacs to segfault. When the above three files are removed manually _and_ the X server is restarted, the problem disappears. So I guess unmerging font-adobe-100dpi should already have removed the above three files.
Created attachment 201587 [details, diff] x-modular.eclass.alias.diff
ACK from me. Thanks Ryan :)
d'oh, forgot to CC myself. applied.