diff -up virtuoso-opensource-5.0.12/libsrc/Wi/bif_file.c.zlib virtuoso-opensource-5.0.12/libsrc/Wi/bif_file.c
--- virtuoso-opensource-5.0.12/libsrc/Wi/bif_file.c.zlib	2009-10-16 05:27:36.000000000 -0500
+++ virtuoso-opensource-5.0.12/libsrc/Wi/bif_file.c	2009-10-20 08:42:56.060132625 -0500
@@ -57,7 +57,13 @@
 #endif
 
 #include "zlib.h"
-#include "zutil.h"
+/* #include "zutil.h" */
+#if MAX_MEM_LEVEL >= 8
+#  define DEF_MEM_LEVEL 8
+#else
+#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
+#endif
+
 #include "srvmultibyte.h"
 
 #define FS_MAX_STRING	(10L * 1024L * 1024L)	/* allow files up to 10 MB */