That is... not what I expected... I must admit, that is VERY odd, since I did not make those executables, but rathers, they were compiled by silnarm and are the "official" binaries on the GAE thread. Perhaps it has something to do with the OS. Unfortunately, I know very little about linux and their executables, so I think perhaps Silnarm or someone with lots of linux experience is best off to answer this... Anyway, they are unmodified binaries for GAE 0.2.13, so if you have that, you can just copy that executable to play.
Good to know the installer works well, though I am a bit puzzled by this... I also must admit, I've never even heard of "Sabayon", so I got no clue about it or the executable types it needs. Of course, you can always compile GAE from source, should need be, and that should work well if other's executables fail.