Index: src/socket.h
--- src/socket.h.orig
+++ src/socket.h
@@ -13,7 +13,7 @@
 #define SOCK_RECV	0
 #define SOCK_SEND	1

-struct World   *world_decl;	/* declares struct World */
+struct World;	/* declares struct World */

 extern Aline *incoming_text;
 extern int quit_flag;