glade can benefit from dev-util/devhelp installation by providing the documentation dirctly through is interface. Should be added to the deps
devhelp is not needed at build time in anyway and devhelp support is detected at runtime with no problem. This is at best worth an elog message.
+ 26 Nov 2012; Gilles Dartiguelongue <eva@gentoo.org> -glade-3.10.2.ebuild, + glade-3.12.2.ebuild: + Add suggestion to install devhelp, bug #416495.