1 files changed, 5 insertions, 0 deletions

diff --git a/lisp/gud.el b/lisp/gud.el
index 65008f28e1f..d5eaf466601 100644
--- a/lisp/gud.el
+++ b/lisp/gud.el
@@ -90,6 +90,11 @@ This association list has elements of the form
           (if key
               (list 'define-key 'gud-mode-map key  (list 'quote func))))))
 
+;; Where gud-display-frame should put the debugging arrow.  This is
+;; set by the marker-filter, which scans the debugger's output for
+;; indications of the current pc.
+(defvar gud-last-frame nil)
+
 ;; All debugger-specific information is collected here
 ;; Here's how it works, in case you ever need to add a debugger to the table.
 ;;