Okay, so you got me... I was actually trying to obscure a little bit the actual path I'm using (just paranoia on my part about disclosing full directory structures). Made the change in what I posted as config but not in the php warnings. But the cat's out of the bag, so I might was well confess... *actual* config.php:
define('ABSOLUTE_SCRIPT_PATH','/Library/WebServer/Documents/tools/phpdig');
if ((!isset($relative_script_path)) || (($relative_script_path != ".") &&
($relative_script_path != "tools/phpdig") && ($relative_script_path != "..") && ($relative_script_path != ABSOLUTE_SCRIPT_PATH)))
And *actual* command I'm using is:
/usr/local/php/bin/php -f /Library/WebServer/Documents/tools/phpdig/admin/spider.php http://www.mydomain.com
Sorry to be misleading and by doing so waste anyone's time. I'm an idiot.