After installing zlib-1.2.13-1.ppc , I'm no longer able to compile.

My gcc is :  lrwxrwxrwx    1 root     system           23 Jun 13 12:13 /bin/gcc -> /opt/freeware/bin/gcc-9

When I compile I get : 

Could not load program /opt/freeware/libexec/gcc/powerpc-ibm-aix7.2.0.0/9/cc1:

Symbol resolution failed for cc1 because:

        Symbol _GLOBAL__AIXI_libz_so (number 291) is not exported from dependent

          module /opt/freeware/lib/libz.a(libz.so.1).

        Symbol _GLOBAL__AIXD_libz_so (number 292) is not exported from dependent

          module /opt/freeware/lib/libz.a(libz.so.1).

Examine .loader section symbols with the 'dump -Tv' command.

This was solved as I was missing some rpm's