latest XFS patch doesnt work on RELENG_6 anymore

Hi

I'm trying to patch my recently fetched RELENG_6 src/sys.
I managed to get it to work some time ago on FreeBSD 6.0-BETA5.

But now while performing make depend I get:

[ more stuff cut out ]
../../../gnu/fs/xfs/xfs_iomap.c:60:23: xfs_error.h: No such file or 
directory
../../../gnu/fs/xfs/xfs_iomap.c:61:24: xfs_itable.h: No such file or 
directory
../../../gnu/fs/xfs/xfs_iomap.c:62:20: xfs_rw.h: No such file or directory
../../../gnu/fs/xfs/xfs_iomap.c:63:21: xfs_acl.h: No such file or directory
../../../gnu/fs/xfs/xfs_iomap.c:64:21: xfs_cap.h: No such file or directory
../../../gnu/fs/xfs/xfs_iomap.c:65:21: xfs_mac.h: No such file or directory
../../../gnu/fs/xfs/xfs_iomap.c:66:22: xfs_attr.h: No such file or directory
../../../gnu/fs/xfs/xfs_iomap.c:67:26: xfs_buf_item.h: No such file or 
directory
../../../gnu/fs/xfs/xfs_iomap.c:68:29: xfs_trans_space.h: No such file 
or directory
../../../gnu/fs/xfs/xfs_iomap.c:69:23: xfs_utils.h: No such file or 
directory
../../../gnu/fs/xfs/xfs_iomap.c:70:23: xfs_iomap.h: No such file or 
directory
../../../gnu/fs/xfs/xfs_behavior.c:33:17: xfs.h: No such file or directory
mkdep: compile failed
*** Error code 1

Stop in /usr/src/sys/i386/compile/FORTUNA.

So I assume that the latest XFS patch doesnt work anymore on 6.x?
I tried it also with 7-CURRENT but got the same shit above, I think its
a path problem but not sure how to fix it and its just strange since it 
worked to me just a couple of days before.

Another problem is that it isnt possible to build xfs.ko (as descriped 
_at_http://people.freebsd.org/~rodrigc/xfs/)
because the /usr/src/sys/modules/xfs/Makefile is lacking completly.
( I managed to satisfy the building routine by copying another Makefile 
into the modules/xfs directory - so that I was able to build xfs into my 
last kernel )
I tried it now various times and also on a complete clean /usr/src 
directory while /usr/obj was completly clean too.
No luck - is xfs for FreeBSD still maintained and developed?
I hope that anybody can give me at least a hint what Im doing wrong.

cheers

Georg