Error executing dbcreate

with PostgreSQL 7.3.2.

I'm running linux (mandrake 9.0).

I successfully executed the followed instructions:

     ./configure
     make
     su
     make install
     adduser postgres
     mkdir /usr/local/pgsql/data
     chown postgres /usr/local/pgsql/data
     su - postgres
     /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
     /usr/local/pgsql/bin/postmaster -D /usr/local/pgsql/data logfile
   2>&1 &

And failed executing this:
     /usr/local/pgsql/bin/createdb test
with this error:
     ERROR:  'autocommit' is not a valid option name

What is the problem?