https://lists.gnu.org/archive/html/bug-readline/2016-11/msg00000.html

fix from upstream

--- a/readline.h
+++ b/readline.h
@@ -413,6 +413,7 @@
 extern void rl_tty_set_default_bindings PARAMS((Keymap));
 extern void rl_tty_unset_default_bindings PARAMS((Keymap));
 
+extern int rl_tty_set_echoing PARAMS((int));
 extern int rl_reset_terminal PARAMS((const char *));
 extern void rl_resize_terminal PARAMS((void));
 extern void rl_set_screen_size PARAMS((int, int));