Starting PostgreSQL server as root

I installed PostgreSQL 7.3.4 on a red Hat Linux 8.0 system.

When I try to install clusters using initdb and postmaster commands to start
server and database, an error occurs:

You cannot run initdb -D /usr/local/pgsql/data as root. Please log in as the
(unprivileged) user that will own the server process.

Ok. I know that I need to log in as another Linux user to start PostgreSQL.

My problem is that I need to log on as root to access another process such as
Firebird.

Does exist a way to start Postgre as root?

I appreciate some help

Best Regards

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