Please read the explanation provided by theHow to usepage.
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This site contains a collection of open source and GNU (R) software packages built for AIX 6, and AIX 7.
Some of these packages (like GCC and GCC-related) have one package per AIX version but in most cases, a package built for an AIX release will also run on upper releases. We are currently building mainly on AIX 6.1.
Packages for AIX N do not run on lower versions (e.g. packages for AIX 7.1 do not run on AIX 6.1 or on 5.3).