[CentOS] group install KDE does not enable runtime?

Thu Nov 6 21:00:18 UTC 2014
James B. Byrne <byrnejb at harte-lyne.ca>

In my continuing investigation of CentOS-7 I did yet another minimal install. 
Subsequent to that I ran yum update kernel, and then yum group install KDE.

Now, KDE installed about 480Mb of stuff, which compares favourably to Gnome's
971Mb.  However, when I run startx from the command line, instead of getting a
desktop I see these errors instead:

xauth: file /root/.serverauth.12462 does not exist

xinit: unable to run server "/usr/bin/X": No such file or directory

Followed by instructions on how to link "/usr/bin/X" to ones choice of display
server.  This seems a little awkward for a mature distro.  Is it really the
case that one must hand link files to get any other desktop instead of gnome? 
is this by design?


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