dev-lang/inform-6.31.1 has an Emacs editing mode included in its tarball (in directory contrib/). We have it also in the Portage tree as a separate package, app-emacs/inform-mode. Please consider adding inform-mode to PDEPEND of inform.
Created attachment 138457 [details, diff] Proposed changes for inform-6.31.1.ebuild
No reaction for a month, so fixing.