Require cl for the loop macro in org-ascii.el

lisp/org-ascii.el

@@ -27,6 +27,8 @@
 ;;; Commentary:
 
 (require 'org-exp)
+(eval-when-compile
+  (require 'cl))
 
 (defgroup org-export-ascii nil
   "Options specific for ASCII export of Org-mode files."