FATAL: role "postgres" does not exist - Mailing list pgsql-ports

Hi all,
Back again with another FreeBSD 'centric question.  I'm running the OpenNMS installer which "configures PostgreSQL
tables,users, and other miscellaneous settings." 

It bombs with this:

Exception in thread "main" org.postgresql.util.PSQLException: Backend start-up failed:
org.postgresql.util.PSQLException:FATAL: role "postgres" does not exist 

I don't know what it's looking for.  When you install the server from ports, it creates the user "pgsql" in
/etc/passwd.  

How do I get the "role" postgres?  Is that a role in Postgresql that I need to create?

opennms# sh install -disU
==============================================================================
OpenNMS Installer Version $Id: Installer.java 3056 2006-03-26 19:39:16Z djgregor $
==============================================================================

Configures PostgreSQL tables, users, and other miscellaneous settings.

Exception in thread "main" org.postgresql.util.PSQLException: Backend start-up failed:
org.postgresql.util.PSQLException:FATAL: role "postgres" does not exist 

        at org.postgresql.jdbc1.AbstractJdbc1Connection.openConnectionV3(AbstractJdbc1Connection.java:460)
        at org.postgresql.jdbc1.AbstractJdbc1Connection.openConnection(AbstractJdbc1Connection.java:214)
        at org.postgresql.Driver.connect(Driver.java:139)
        at java.sql.DriverManager.getConnection(DriverManager.java:512)
        at java.sql.DriverManager.getConnection(DriverManager.java:171)
        at org.opennms.install.Installer.databaseConnect(Installer.java:613)
        at org.opennms.install.Installer.install(Installer.java:195)
        at org.opennms.install.Installer.main(Installer.java:2450)


Any suggestions?

Thanks,
Bob