Forward declare a struct and #include <sys/queue.h> so that this file

is more "self"-sufficent.

sys/sys/lockf.h

@@ -34,12 +34,16 @@
  * SUCH DAMAGE.
  *
  *	@(#)lockf.h	8.1 (Berkeley) 6/11/93
- * $Id: lockf.h,v 1.7 1997/02/22 09:45:31 peter Exp $
+ * $Id: lockf.h,v 1.8 1997/09/07 05:27:16 bde Exp $
  */
 
 #ifndef _SYS_LOCKF_H_
 #define	_SYS_LOCKF_H_
 
+#include <sys/queue.h>
+
+struct vop_advlock_args;
+
 /*
  * The lockf structure is a kernel structure which contains the information
  * associated with a byte range lock.  The lockf structures are linked into