File mtr-0.73-nonvoid.patch of Package mtr

--- display.c
+++ display.c
@@ -37,7 +37,7 @@
 #define mtr_curses_open()
 #define mtr_curses_close()
 #define mtr_curses_redraw()
-#define mtr_curses_keyaction()
+#define mtr_curses_keyaction() 0
 #define mtr_curses_clear()
 #else
 #include "mtr-curses.h"