diff --git a/Makefile b/Makefile
index f8ee01d..ffbcd81 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-# $Id: Makefile,v 1.26 2005/06/27 17:06:01 tomas Exp $
+# $Id: Makefile,v 1.27 2006/06/08 16:23:25 tomas Exp $
 
 T= lfs
 V= 1.2
@@ -6,7 +6,10 @@ CONFIG= ./config
 
 include $(CONFIG)
 
+ifeq "$(LUA_VERSION_NUM)" "500"
 COMPAT_O= $(COMPAT_DIR)/compat-5.1.o
+endif
+
 SRCS= src/$T.c
 OBJS= src/$T.o $(COMPAT_O)
 
diff --git a/config b/config
index 5bbd47a..9958952 100644
--- a/config
+++ b/config
@@ -9,6 +9,11 @@ LIB_OPTION= -shared #for Linux
 #LIB_OPTION= -bundle -undefined dynamic_lookup #for MacOS X
 
 LIBNAME= $T.so.$V
+# Lua version number
+# (according to Lua 5.1 definition:
+# first version digit * 100 + second version digit
+# e.g. Lua 5.0.2 => 500, Lua 5.1 => 501, Lua 5.1.1 => 501)
+LUA_VERSION_NUM= 500
 COMPAT_DIR= ../compat/src
 
 # Compilation directives
@@ -17,4 +22,4 @@ INCS= -I$(LUA_INC) -I$(COMPAT_DIR)
 CFLAGS= $(WARN) $(INCS)
 CC= gcc
 
-# $Id: config,v 1.14 2005/06/24 01:49:16 tomas Exp $
+# $Id: config,v 1.15 2006/06/08 16:23:25 tomas Exp $