Index: nn_term.h
--- nn_term.h.orig
+++ nn_term.h
@@ -48,7 +48,7 @@ extern int      STANDOUT;
  */
 
 
-int             prompt_line;	/* prompt line */
+extern int      prompt_line;	/* prompt line */
 
 #define	P_MOVE		(char *)1
 #define P_REDRAW	(char *)5
