"lua_state" is already declared in lua.h, which is included here.

lstate.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 1.11 1998/06/24 13:33:00 roberto Exp roberto $
+** $Id: lstate.h,v 1.12 1998/08/21 17:43:44 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -76,9 +76,6 @@ struct lua_State {
 };
 
 
-extern lua_State *lua_state;
-
-
 #define L	lua_state