--- Gnu-Mach/device/buf.h	2020/09/02 04:45:33	1.1.1.2
+++ Gnu-Mach/device/buf.h	2020/09/02 04:47:54	1.1.1.3
@@ -30,6 +30,9 @@
  * 	Definitions to make new IO structures look like old ones
  */
 
+#ifndef _DEVICE_BUF_H_
+#define _DEVICE_BUF_H_
+
 /*
  * io_req and fields
  */
@@ -80,11 +83,6 @@
 #define	B_MD1		IO_SPARE_START
 
 /*
- * Redefine uio structure
- */
-#define	uio	io_req
-
-/*
  * Redefine physio routine
  */
 #define	physio(strat, xbuf, dev, ops, minphys, ior) \
@@ -100,3 +98,5 @@ extern void minphys(io_req_t);
  */
 #define	biodone	iodone
 #define biowait iowait
+
+#endif /* _DEVICE_BUF_H_ */