The return value of getch() must be stored in an int to handle KEY_*
values.

Index: src/gui_input.c
--- src/gui_input.c.orig
+++ src/gui_input.c
@@ -601,9 +601,9 @@ gui_input_loop(void)
 int
 gui_input_askyesno(const char *question)
 {
-	char *msg, input;
+	char *msg;
 	const char *yes, *no;
-	int ret;
+	int input, ret;
 
 	/* Skip the question if the user really wants so */
 	if (!config_getopt_bool("gui.input.confirm"))