you're receiving this canned bug because the package in summary uses the flag -Werror during build, which transforms warnings in errors, and is prone to break software when new GCC releases are added to Gentoo.
Please make sure your package does not use -Werror during build, so that it can be more future-proof for the new GCC releases.
Created attachment 197881 [details]
+ 10 Aug 2009; Samuli Suominen <firstname.lastname@example.org> openhpi-2.12.0.ebuild:
+ Fix building with GCC 4.4+ by removing -Werror wrt #277765.