Strip X Window System from OpenRD (Fedora core 8)

I just got myself an OpenRD Client embedded box with an old Fedora 8 on it. Runs like a charm, only problem is that the default install has X on it, which I would like to remove in order to free up some space.

I found a similar post here on the same topic, but yum groupremove doesn't work in my case, yum grouplist returns nothing, so I presume that no groups are defined. I don't know if this is because fedora 8 didn't have any groups, or because the OpenRD build is special in some way.

In any case, I would like some tips on which package(s) to remove in order to remove an as big chunk of X as possible.

Thanks in advance.