unzip has a 'sgi' build target. The app-arch/unzip-5.52-r1 ebuild, on the other hand, merely outputs 'Unknown target, you suck' Professional, guys...
Remember that Gentoo originates to be a Linux only distribution. I can't help it some people considering that OS to be superior to any other ... I added the sgi target for IRIX. (weird that the target is sgi, and not irix, by the way)