Currently, perl1 doesn't build using anything other than gcc on AIX. This
is a TODO list item, but until that point please consult this note
extracted from perl-5.8.2's README.aix

=head2 Using GNU's gcc for building perl

Using gcc-3.x (tested with 3.0.4, 3.1, and 3.2) now works out of the box,
as do recent gcc-2.9 builds available directly from IBM as part of their
Linux compatibility packages, available here:

  http://www.ibm.com/servers/aix/products/aixos/linux/

=head1 AUTHOR

H.Merijn Brand <h.m.brand@hccnet.nl>