--- aufs/fs/aufs25/vfsub.h.orig	2009-03-16 00:09:09.000000000 +0100
+++ aufs/fs/aufs25/vfsub.h	2009-03-16 00:09:22.000000000 +0100
@@ -207,7 +207,7 @@
 }
 #endif
 
-#ifndef CONFIG_AUFS_BR_XFS
+#ifdef CONFIG_AUFS_BR_XFS
 /* br_xfs.c */
 dev_t au_h_rdev(struct inode *h_inode, struct vfsmount *h_mnt,
 		struct dentry *h_dentry);
--- aufs/fs/aufs25/br_xfs.c.orig	2009-08-06 14:40:11.000000000 +0200
+++ aufs/fs/aufs25/br_xfs.c	2009-08-06 14:39:08.000000000 +0200
@@ -24,6 +24,7 @@
 
 #include "aufs.h"
 
+#ifdef CONFIG_AUFS_BR_XFS
 /* h_mnt can be NULL, is it safe? */
 dev_t au_h_rdev(struct inode *h_inode, struct vfsmount *h_mnt,
 		struct dentry *h_dentry)
@@ -67,3 +68,4 @@
  out:
 	return rdev;
 }
+#endif