requiring a password to connect

Hi all,

    I am using postgresql in conjunction with php.  The following code works to
establish a database connection:

$db = pgConnect("dbname=mydb user=myuser");


    I would prefer it if this would fail to connect.  Is there a command line
switch I can use to start the postmaster that will require a password to be
passed in the connection string?  Or do I need to recompile postgresql with
a particular option to achieve the desired behavior?  I have experienced the
above on 6.5.3, 7.0.2 and 7.1.2.

    Thank you very much for your time,
        ~c