gentoo-overlay/app-emulation/xen-tools/files/xen-tools-3.4.2-fix-definitions.patch

--- tools/blktap/lib/blktaplib.h.orig	2011-09-21 19:29:30.240868534 +0800
+++ tools/blktap/lib/blktaplib.h	2011-09-21 19:34:21.184868372 +0800
@@ -195,8 +195,13 @@
 	pid_t     pid;
 } msg_pid_t;
 
+#ifndef READ
 #define READ 0
+#endif
+
+#ifndef WRITE
 #define WRITE 1
+#endif
 
 /*Control Messages between manager and tapdev*/
 #define CTLMSG_PARAMS      1