Apply by doing:
	cd /usr/src/sys/nfs
	patch < nfs3.patch

Then build and boot a new kernel.

Index: xdr_subs.h
===================================================================
RCS file: /cvs/src/sys/nfs/xdr_subs.h,v
retrieving revision 1.5
diff -u -r1.5 xdr_subs.h
--- xdr_subs.h	1998/08/19 22:26:59	1.5
+++ xdr_subs.h	1998/12/28 23:25:52
@@ -82,8 +82,8 @@
 }
 
 #define	fxdr_hyper(f) 						\
-        ((((u_quad_t)ntohl(((int32_t *)(f))[0])) << 32) |	\
-	 (u_quad_t)(ntohl(((int32_t *)(f))[1])))
+        ((((u_quad_t)ntohl(((u_int32_t *)(f))[0])) << 32) |	\
+	 (u_quad_t)(ntohl(((u_int32_t *)(f))[1])))
 
 
 #define	txdr_hyper(f, t) { \