You will need the basic X libraries and programs installed, but you don't need to actually configure X on the headless computer. If you do it like I usually do you can just enable X forwarding in the sshd_config on the server computer and then ssh to the server from an xterm (aterm, wterm, Eterm, Console...whatever) using ssh -X user@host and launch graphical applications on the server that will display on your local computer (using the local X server for display).
Håkan
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