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$ oslevel
5.2.0.0
...
Path: /usr/lib/objrepos
  xlC.rte                    9.0.0.9  COMMITTED  XL C/C++ Runtime
$

At the moment of writing, AIX supports two different native C compiler
+s,
for which you have to pay: B<xlC> and B<vac>. If you decide to use eit
+her
...

    xlC.C     3.1.4.10 or 3.6.6.0 or 4.0.2.2 or 5.0.2.9 or 6.0.0.3
    vac.C     4.4.0.3  or 5.0.2.6 or 6.0.0.1