You're receiving this bug because the package in Summary has produced _FORTIFY_SOURCE related warnings indicating the presence of a sure overflow in a static buffer.
Even though this is not always an indication of a security problem it might even be. So please check this out ASAP.
By the way, _FORTIFY_SOURCE is disabled when you disable optimisation, so don't try finding out the cause using -O0.
Your friendly neighborhood tinderboxer
Created attachment 248144 [details]
+*infernal-1.0.2-r1 (04 Nov 2010)
+ 04 Nov 2010; Kacper Kowalik <firstname.lastname@example.org> -infernal-1.0.ebuild,
+ +infernal-1.0.2-r1.ebuild, +files/infernal-1.0.2-ldflags.patch,
+ Fix parallel build wrt bug 311919. Thanks to Myckel Habets
+ <email@example.com> for patch and report. Fix buffer
+ overflow wrt bug 338179 and respect LDFLAGS wrt bug 338177. Thanks to
+ Diego Elio Pettenò for the reports. Drop old.