the following fixes it:
16:01 < dan_b> I would hazard that if you replace the call to xlib:open-display with xlib:oipen-default-display (and no arguments) it'd probably work fine 16:01 < timmyd> and the other error message is echod to the terminal 16:01 < dan_b> but open-default-display is not part of standard CLX 16:02 < dan_b> (that's in the initialize-clx method in Backends/CLX/port.lisp, around line 236 in my copy)
(defmethod initialize-clx ((port clx-port)) (let ((options (cdr (port-server-path port)))) (setf (clx-port-display port) (xlib:open-default-display)) (progn (setf (xlib:display-error-handler (clx-port-display port)) #'clx-error-handler)