Index: tools/autogen.py
===================================================================
--- tools/autogen.py	(revision 0b811da2fba360e57108ff503269eeccc6eedf0b)
+++ tools/autogen.py	(revision 81f094085f38262d464fd94bac30357601557fd0)
@@ -46,8 +46,9 @@
 %s
 
-main()
+int main()
 {
 %s
 	emit_constant(%s_SIZE, sizeof(%s));
+	return 0;
 }
 	""" % (generate_includes(struct), generate_struct(struct),