[CentOS] Wine on Centos 5.2 - "X Development Files"

Hi there,

I am currently compiling wine (latest) on centos 5.2. My compiler had  
error'd out with "X development files not found". Now I had done a yum  
groupinstall "X Windows System" without any luck. I just don't want to  
have to install anything on top of what I need to.

So what packages compose the "X development files"?

d