Can I get some help with adding gdlib support to my php installation??

I've recently migrated my site to PHP, and everything works fine but I installed a statlog tool made in PHP that uses gdlib to make dinamic images in order to make graphs of the stats on my site. My problem is that when I compiled PHP I had no need for the gdlib support and didn't compile it in, so now that I need it I go to the gdlib page and download the gdlib source, and the jpeg support source, and the png support source and follow the instructions but I still don't have graphics support enabled on my PHP build, in fact if I do a phpinfo() I get that the compilation instructions are with-apache and with-mysql, and some other things but not the gdlib support. Please help. TIA. Iván