Those are packages needed when applications are built using gcc.
Not sure how long PERZL is staying active:
http://www.perzl.org/aix/ - afaik, his packaging was consistent with the BULL freeware site. So, looking there first may be your best bet - as he also has/had support for AIX 6.1
Otherwise: for about AIX 6.1 support by AIXToolbox (IBM site):
https://www.ibm.com/support/pages/node/883796?mhsrc=ibmsearch_a&mhq=AIXToolboxPlease note: you cannot MIX RPM's from BULL/PERZL and IBM (AIXToolbox).
The packages I supply are not RPM's, and generally speaking, run using IBM supported run-time-libraries because I use 'xlc' as my compiler rather than gcc.
- so, to specifically answer your question: I have never, nor do I intend to start, supporting RPM package requirements.
So, my question: what OSS packages are vital for your projects?