aircrack-ng uses an old version of John the Ripper, the whole Altivec acceleration code does not build since the move to clang/compiler_rt; it fails with ports-gcc as well. John codebase massively changed in this regard since then, making backports too massive. Remove AltiVec support and associated PFRAG, with a patch ensuring that AltiVec and POWER8 are *really* disabled at build time (from upstream). OK benoit@ (maintainer)