The changelog http://www.gentoo.org/cgi-bin/viewcvs.cgi/*checkout*/media-sound/lilypond/ChangeLog says for 2006-03-28: "Restrict older lilyponds to tetex-2 which provides /usr/bin/inimf #92040." In spite of, now even lilypond-2.8.0-r1 depends on tetex-2 where it worked smoothly here before, with tetex-3. 2.8.0 isn't an "older lilypond", so please undo this change. Thanks.
*** This bug has been marked as a duplicate of 92040 ***