Extension_dir in php.ini?

Okay, you may call me an idiot all you want, But if the extension_dir= ./ In php.ini And PHP is loaded as an apxs module in apache, then just where does ./ point to? ServerRoot? DocumentRoot? Some other directory? Having a major brain **** in getting my .so into the right place. Also, how can I compile libpdf.so (version 3) to work with PHP4.0.4pl1? If I have to go backwards in PHP (say to 4.0.3pl1) to be able to get PDF support compiled into PHP (because it just isn't working for me on 4.0.4pl1) then somebody please tell me that. I have read through all the suggestions in the list archive I have downloaded the latest versions of files pertaining to pdf and 4.0.4pl1 from cvs.php.net and yet, I still get the problem, during ./configure, of it complaing about my version 3 pdflib, not being version 3 because it can't find pdf_show_boxed(). I _NEED_ pdf support, so any help in choosing the right set of versions would be greatly helpful! Thanks gang! Ps- yes, I also changed ext/crypt.c php_srand... On line 150(or thereabouts) to make php work at all on my box (Qube2)