Help needed: Failed opening '' for inclusion

Hi, To test a new php installation I accessed a page called index.php that contains only <?php phpinfo(); ?> but that produces this error: Warning: Failed opening '' for inclusion (include_path='.:/usr/local/lib/php:/usr/local/include/php:/usr/local/bin/ph p') in Unknown on line 0 This seems very odd given that: a) the error does not specify any filename that failed opening, only '', and b) permissions of the index.php file and the include path directories are readable by all users. I have even started the php fastcgi runner as root to double-check the permissions aspect of this. The setup is php 4.0.6 with Zeus webserver version 4 using FastCGI on Solaris 2.6. Any ideas? Help of any sort would be greatly appreciated. Thanks, Dave De Graff