I believe you need vac.C - not sure about C ++ since we don't use it.

# lslpp -l vac.C
Fileset Level State Description

----------------------------------------------------------------------------
Path: /usr/lib/objrepos
vac.C 6.0.0.0 COMMITTED C for AIX Compiler

Path: /etc/objrepos
vac.C 6.0.0.0 COMMITTED C for AIX Compiler


HTH,
Homeyjoe