--- a/EventHandler.h.old	2006-05-19 22:11:48.000000000 +0200
+++ b/EventHandler.h	2006-05-19 22:11:58.000000000 +0200
@@ -165,7 +165,7 @@
 
     int  number_of_reference_stickers_needed;
     int  (*reference_stickers_needed)[4];
-    void (EventHandler::*what_to_do_after_got_reference_stickers) (void *arg = NULL);
+    void (EventHandler::*what_to_do_after_got_reference_stickers) (void *arg);
     void* cur_ui_data;
 
     bool quick_mode;
--- a/Machine.h.old	2006-05-19 22:12:17.000000000 +0200
+++ b/Machine.h	2006-05-19 22:12:29.000000000 +0200
@@ -31,7 +31,7 @@
 {
 public:
     typedef void (EventHandler::*event_handler)(EventHandler::Event*,
-                                                void *arg = 0);
+                                                void *arg);
     virtual ~Machine() {};
 
     static Machine* createMachine(EventHandler*, int& argc, char *argv[],