Created attachment 379034 [details, diff] patch for ppc-aix support, before bootstrap AIX does not have: getopt*, strcasestr, asprintf. With attached patch against current git/master I've been able to get portage-utils to work so far on AIX 6.1 here. Thanks!
i did things slightly differently, but it should be fixed for the next release. thanks for the report! http://git.overlays.gentoo.org/gitweb/?p=proj/portage-utils.git;a=commitdiff;h=119ad4c193f5689953a32babbc6a3a7eed041f3a