net-libs/libtorrent-0.11.9 and -0.12.2-r2 gave unaligned accesses on HPPA due to a configure problem, see "Incomplete alignment test" in http://libtorrent.rakshasa.no/wiki/LibTorrentKnownIssues Adding --enable-aligned to econf flags in libtorrent-0.12.2-r2.ebuild solves the issue.
We now use enable-aligned.