imageio configure?

Roger,

I wonder if someone   could elaborate on the ./configure magic  
needed to find the libPng  in the imageio framework.

Even if you find it, it won't help unless you write a wrapper dylib,  
because the symbol names are different (they start with cg_). In  
addition, there are no header files for those private frameworks,  
either, so you won't be able to compile any code against it unless  
you make your own.

Cheers,
Simon