diff --git a/Makefile b/Makefile
index dbc4674..6d89f42 100644
--- a/Makefile
+++ b/Makefile
@@ -26,10 +26,10 @@ OBJS = \
 	vectors.o\
 
 # Cross-compiling (e.g., on Mac OS X)
-TOOLPREFIX = i386-jos-elf-
+#TOOLPREFIX = i386-jos-elf-
 
 # Using native tools (e.g., on X86 Linux)
-#TOOLPREFIX = 
+TOOLPREFIX = 
 
 CC = $(TOOLPREFIX)gcc
 AS = $(TOOLPREFIX)gas
diff --git a/xv6-rev2.tar.gz b/xv6-rev2.tar.gz
index be6e390..8affba0 100644
Binary files a/xv6-rev2.tar.gz and b/xv6-rev2.tar.gz differ