In article <199604150148.VAA01970@zygorthian-space-raiders.MIT.EDU>,
Charles M. Hannum <mycroft@mit.edu> wrote:
> 
> NOTE: YOU MUST BE RUNNING AN UP TO DATE -current KERNEL FOR THIS TO
> WORK PROPERLY!  If your kernel is not up to date, please don't even
> try it, and certainly don't report any bugs.  I've included the RCS
> tags of the relevant files below.

You also have to have X (at least the includes and libs) installed.