the qmail ebuilds run "emake it man", but there is not need for "man". make man creates parsed man pages (*.0), but the ebuild then installs the original man pages (*.[1-8]) -- absolutely pointless.
I spoke too fast. make man creates the following man pages: dot-qmail.5 qmail-control.5 qmail-getpw.8 qmail-limits.7 qmail-newmrh.8 qmail-newbrt.8 qmail-newu.8 qmail-pw2u.8 qmail-send.8 qmail-start.8 qmail-users.5 Could add them to the command line in place of "man"
Closing.
Mmmm, just thought of something else. If the .0 pages are not generated, i.e. if the ebuild does not do "make man", then there would be no sys-apps/groff dependency. And what is groff depended on for? To generate pages that are discarded. Anyway, just wanted to through in this comment.