(defvar x-cut-buffer-max 20000
"Max number of characters to put in the cut buffer.")
-(defvar x-select-enable-clipboard nil
+(defcustom x-select-enable-clipboard nil
"Non-nil means cutting and pasting uses the clipboard.
-This is in addition to the primary selection.")
+This is in addition to, but in preference to, the primary selection."
+ :type 'boolean
+ :group 'killing)
;;; Make TEXT, a string, the primary X selection.
;;; Also, set the value of X cut buffer 0, for backward compatibility