After lots of testing I finally found that the described combination of
software components is not working.
It seems that IBM C-Compiler xlc 9.0 is at its end of life.
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In the meantime I changed my environment:
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AIX from 5.300-12-03-1119 to AIX 6100-05-05-1112=20
PostgreSQL 9.1.2 to PostrgreSQL 9.1.3
IBM C-Compiler xlc 9.0 to IBM C-Compiler xlc 11.1=20=20
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I can now confirm that the issue with initdb disappeared.=20
Everything is working fine, again.
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However it is very sad that there is so few AIX support on this site :-(
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Best Regards
Wilfried
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