[expert] Where are the h files for gcc?

[Stephen P. Molnar, Ph.D.]

I have just terminated a very frustrating two week attempt to go from 
v6.0,  which has worked flawlessly on my K6-2/300 since first installed, to 
v6.1.  On my machine, at any rate, kde seems to be buggy  in v6.1 so I gave 
up and reinstalled v6.0.

My current problem is that I apparently forgot to install something as the 
compiler can't seem to find files such as stdio.h, getppt.h, etc.  I feel 
kind of silly asking, because the compiler used to work, before my upgrade 
attempt, but what's missing?

Thanks in advance.