--- config-msvc.h.orig	2016-06-23 14:14:35.062500000 +1000
+++ config-msvc.h	2016-06-23 14:14:56.296875000 +1000
@@ -143,7 +143,7 @@
 #define HAVE_SYS_TYPES_H 1
 
 /* Define to 1 if you have the <unistd.h> header file. */
-#define HAVE_UNISTD_H 1
+/*#define HAVE_UNISTD_H 1*/
 
 /* Define to 1 if you have the <zlib.h> header file. */
 #define HAVE_ZLIB_H 1
