Blogged "Compiling XS Code on AIX" in my Perl blog.
Your post only appears to address modules which use ExtUtils::MakeMaker. Have you had trouble with modules using Module::Build?
Re:What about ExtUtils::CBuilder?
hanekomu on 2008-09-16T07:50:01
I didn't look which build system those modules used, but I don't think it matters whether you use one or the other. The problem is with the C compiler - gcc works for me, xlc and cc_r don't.