post-bootstrap init : permission denied pg_description

Hello All,

I am trying to install PostgreSQL 16.4 on AIX 7.1.

I get an error at initdb step :

performing post-bootstrap initialization ... 2024-09-12 12:09:07.075 CEST [14745748] FATAL: permission denied for table pg_description

This version of PostgreSQL was build on this machine with
IBM XL C compiler 10.1 :

export OBJECT_MODE=64
$srcdir/configure --prefix=$instdir --without-icu
make
make install

When I run initdb with -n option, I can see that files in
PGDATA directory seem to have expected permissions.

I have tried to install PostgreSQL 15.1, 16.0 and 16.3
but got the same error with all these versions.

Any help would be appreciated.

François