I think I had to use a gcc v7 for it to work... But wont be affirmative because the same week I compiled on the same architecture (aix) a python 3.X...
That reminds me some time ago when I compiled python and had issues, are you sure you fullfill all the prerequisites? especially about gcc? as I see your libgcc is of 2005...
Did you look for libinstall ? its permissions and where/what it is?
From what I remember in older days at a SUN presentation of its strategy and evolution (like including X86 servers in roadmap...)...