I have verified that this package works for ppc64. Please add the ~ppc64 KEYWORDS to media-gfx/xsane-0.93. my USE Flag is "X gtk gtk2 usb altivec ppc64 -gnome cjk jpeg gif png tiff truetype"
add deps on bug #57131 This package depends... sane-backends-1.0.14-r3 and libusb-0.1.8
Thanks Yuta
stick a fork in it