diff --git a/lapi.c b/lapi.c
index 5a3b0d26..2bcabed0 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 1.15 1997/12/18 18:32:39 roberto Exp roberto $
+** $Id: lapi.c,v 1.16 1997/12/22 17:52:20 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -580,7 +580,7 @@ lua_Object lua_getref (int ref)
 
 
 
-#if LUA_COMPAT2_5
+#ifdef LUA_COMPAT2_5
 /*
 ** API: set a function as a fallback
 */
diff --git a/lbuiltin.c b/lbuiltin.c
index 2a2ed4d8..0acb19cb 100644
--- a/lbuiltin.c
+++ b/lbuiltin.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbuiltin.c,v 1.19 1997/12/18 18:32:39 roberto Exp roberto $
+** $Id: lbuiltin.c,v 1.20 1997/12/30 17:57:45 roberto Exp roberto $
 ** Built-in functions
 ** See Copyright Notice in lua.h
 */
@@ -464,7 +464,7 @@ static void testC (void)
 ** Internal functions
 */
 static struct luaL_reg int_funcs[] = {
-#if LUA_COMPAT2_5
+#ifdef LUA_COMPAT2_5
   {"setfallback", luaT_setfallback},
 #endif
 #ifdef DEBUG
diff --git a/ltm.c b/ltm.c
index 6cda2973..3c788f41 100644
--- a/ltm.c
+++ b/ltm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.c,v 1.11 1997/12/11 17:21:11 roberto Exp roberto $
+** $Id: ltm.c,v 1.12 1997/12/15 16:17:20 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -174,7 +174,7 @@ char *luaT_travtagmethods (int (*fn)(TObject *))
 * ===================================================================
 * compatibility with old fallback system
 */
-#if	LUA_COMPAT2_5
+#ifdef LUA_COMPAT2_5
 
 #include "lapi.h"
 
diff --git a/lua.h b/lua.h
index bb9b65dd..58e776f6 100644
--- a/lua.h
+++ b/lua.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.11 1997/12/15 17:47:55 roberto Exp roberto $
+** $Id: lua.h,v 1.12 1997/12/18 18:32:39 roberto Exp roberto $
 ** Lua - An Extensible Extension Language
 ** TeCGraf: Grupo de Tecnologia em Computacao Grafica, PUC-Rio, Brazil
 ** e-mail: lua@tecgraf.puc-rio.br
@@ -146,15 +146,11 @@ long	       lua_collectgarbage	(long limit);
 
 /* ==========================================================================
 ** for compatibility with old versions. Avoid using these macros/functions
-** If your program does not use any of these, define LUA_COMPAT2_5 to 0
+** If your program does need any of these, define LUA_COMPAT2_5
 */
 
-#ifndef LUA_COMPAT2_5
-#define LUA_COMPAT2_5	1
-#endif
 
-
-#if LUA_COMPAT2_5
+#ifdef LUA_COMPAT2_5
 
 
 lua_Object     lua_setfallback		(char *event, lua_CFunction fallback);
diff --git a/makefile b/makefile
index 5a9e3aa6..fbf4939a 100644
--- a/makefile
+++ b/makefile
@@ -1,5 +1,5 @@
 #
-## $Id: makefile,v 1.7 1997/12/17 20:48:58 roberto Exp roberto $
+## $Id: makefile,v 1.8 1997/12/23 19:24:36 roberto Exp roberto $
 ## Makefile
 ## See Copyright Notice in lua.h
 #
@@ -15,11 +15,11 @@
 #   facilities ("strerror" and "locale.h"). Although they are ANSI,
 #   SunOS does not comply; so, add "-DOLD_ANSI" on SunOS
 #
-# define LUA_COMPAT2_5=0 if yous system does not need to be compatible with
+# define LUA_COMPAT2_5 if yous system does need to be compatible with
 # version 2.5 (or older)
 
-CONFIG = -DPOPEN -D_POSIX_SOURCE -DLUA_COMPAT2_5=0
-#CONFIG = -DLUA_COMPAT2_5=0 -DOLD_ANSI -DDEBUG
+CONFIG = -DPOPEN -D_POSIX_SOURCE
+#CONFIG = -DLUA_COMPAT2_5 -DOLD_ANSI -DDEBUG
 
 
 # Compilation parameters