Tried viruskiller 0.9 on ppc (it's keyworded ~ppc), but the game has a bug making it unplayable (the viruses don't ever completely go away after being killed). The game works fine on my x86_64 system, so I suspect it is an endian bug.
It's not an endian problem, forcing compilation with -fsigned-char fixes the bug. I've also added a check to ensure that sed has no errors, added a dependancy on pkgconfig and removed the references to zzlib-config. This ensures that the zzlib libraries are located correctly.