[PHP] PNG support...

[Jeff Lewis]

With 4.04 I had PNG working fine and could create images in a cron job I was running.  
When we upgraded to 4.06 we seemed to have lost the ability.  While calling my PHP 
file up in the browser, it creates the image but my cron job keeps failing with this 
error:

ImageCreateFromPng: No PNG support in this PHP build 

Anyone have any hints on how to fix this?

Jeff