[ethereal-users] Gtk-WARNING problem

["Ronald Warner" <cscrw@xxxxxxxxxxxxxxxx>]

I successfully installed ethereal-0.8.8 or so I thought when I ran 
/usr/local/bin/ethereal, it said 
Gtk-WARNING ** cannot open display:

I am using gtk version 1.2.6

What do I do to make it work?

Thanks in advance.