install Xorg headers Red Hat 6 desktop

I'm trying to compile an open-source device driver in Red Hat 6.5 Desktop and the configure script is complaining about not finding #include "xorg-server.h" in the filesystem.

I checked my distribution ("yum list xorg*") and see both "xorg-x11-server-Xorg.x86_64" and "xorg-x11-server-common.x86_64" are installed. I ran this repo-query to see where the files are don't see a link to the headers, "repoquery --list xorg-x11-server-Xorg".

I am new to Red Hat Linux, but worked in Fedora and most recently in Ubuntu. In Ubuntu I can run "sudo apt-get install xserver-xorg-dev". The header files needed are usually in /usr/include/xorg.

What's the RPM command or source repository link for Red Hat 6 to obtain the Xorg headers?
I tried "yum install xorg-x11-server-devel", but it's not in my yum list and doesn't work.

Maybe a really old issue for the community (found this on the RedHat archives, http://www.redhat.com/archives/rhl-list/2006-November/msg03968.html), but I don't see any Xorg headers anywhere on my distribution (/usr/include/xorg doesn't exist in my dist), even if I need to change the name of the include file.

Please don't tell me I need a different Red Hat license to get the source? Maybe the header files are already present in the distribution but I need to install them some other way?