--- iozone.c.orig	Tue Sep 14 17:38:16 1999
+++ iozone.c	Mon May 29 00:42:45 2000
@@ -196,7 +196,9 @@
 #endif
 
 #if defined (__FreeBSD__) || defined(__OpenBSD__)
+#ifndef O_SYNC
 #define O_SYNC O_FSYNC
+#endif
 #endif
 
 #ifndef MAP_FAILED