Hey guys,

I'm running Suse 10 on a box here at work, and I'm trying to set up a LAMP server. While compiling PHP5, I'm getting the following error:

I did a find / -name png.h and got no results. I've been hunting around for an RPM or something that will give me this, but with no luck.

Where should I be looking to resolve this problem?

well the first port of call is to not compile php, there should be plenty of rpm's available for suse to mean you've no reason to.

second port of call is that png.h is going to be in an rpm package called libpng-devel or png-devel on your distro cd's.

I'll tackle the 'What is it" part.
It's a header file (hence the .h file extension). To be more concise, it is likely a C language header file, which would usually have a png.c and/or a png.o file to go along with it.
Typically these files are (in) the sourcecode of something written in C to be compiled, as you are, using GCC or another compiler.
To venture a guess, the file likely should be either inside the kernel source directories, or within the source location of the PHP installation you are compiling.
EDIT: See above simultaneous post!