pgsql-bugs@postgresql.org writes:
> When installing PG 7.2.1 from source on S/390 Linux using the
> --enable-multibyte option I cannot create databases and psql does not
> work at all. Everything is fine using plain ./configure.
I suspect you have a problem with psql linking to a
non-multibyte-enabled copy of libpq.so. Check what "ldd psql" has to
say about resolution of shared library references.
regards, tom lane