$NetBSD: patch-blktaplib_h,v 1.1 2012/01/09 14:06:34 cegger Exp $

--- blktap/lib/blktaplib.h.orig	2009-08-06 12:56:32.000000000 +0000
+++ blktap/lib/blktaplib.h
@@ -42,7 +42,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#define BLK_RING_SIZE __RING_SIZE((blkif_sring_t *)0, XC_PAGE_SIZE)
+#define BLK_RING_SIZE __CONST_RING_SIZE(blkif, XC_PAGE_SIZE)
 
 /* size of the extra VMA area to map in attached pages. */
 #define BLKTAP_VMA_PAGES BLK_RING_SIZE