Index: src/x48_x11.c
--- src/x48_x11.c.orig
+++ src/x48_x11.c
@@ -3833,7 +3833,7 @@ int first_key = 0;
 
 int last_button = -1;
 
-extern char *get_stack(void);
+extern void get_stack(void);
 
 int
 #ifdef __FunctionProto__