Steps to reproduce the issue

Have a connection on a port different than the default and try to make a query on it

    $options = array();
    
    $options['driver']   = 'postgresql';        
    $options['host']     = '192.192.192.192:15432'; 
    $options['user']     = 'myuser';       
    $options['password'] = 'mypassword'; 
    $options['database'] = 'MYDATABASE';
    $options['prefix']   = '';             
    
    $dbo =  JDatabaseDriver::getInstance( $options );

Expected result

I expect to work

Actual result

"Error connecting to PGSQL database."

System information (as much as possible)

Additional comments

Looking at the code (https://github.com/joomla/joomla-cms/blob/staging/libraries/joomla/database/driver/postgresql.php#L122), looks like is missing the port option, as we can see on http://php.net/manual/es/function.pg-connect.php. Modifying the code and adding port=1532, make it work

As a workaround, I can set options['host'] as $options['host'] = '192.192.192.192 port=15432' and does the trick