--- Lib/Zlib/Makefile.orig	Thu Jan 28 08:11:10 1999
+++ Lib/Zlib/Makefile	Sat Oct  2 05:33:19 1999
@@ -2,7 +2,7 @@
 # Copyright (C) 1995-1998 Jean-loup Gailly.
 # For conditions of distribution and use, see copyright notice in zlib.h 
 
-CFLAGS=-O3 -DHAVE_UNISTD_H -DUSE_MMAP
+CFLAGS+=-O3 -DHAVE_UNISTD_H -DUSE_MMAP
 
 CPP=$(CC) -E
 
