I have verified works for ppc64 by applying patches to this package. Please add the ~ppc64 KEYWORDS to net-mail/fetchmail-6.2.5. my USE Flag is "gtk2 altivec ppc64 -gnome cjk jpeg gif png tiff truetype".
Created attachment 34479 [details, diff] patch for fetchmail ebuild
Thanks Yuta!
stick a fork in it