Error compiling kernel in module ath

Hi all,

I have just updated my sources to RELENG_6. The buildworld went ok, but
I cannot compile the kernel. The linking terminates with:

linking kernel
if_ath.o(.text+0x2635): In function `ath_node_alloc':
: undefined reference to `ath_rate_node_init'
if_ath.o(.text+0x268c): In function `ath_node_free':
: undefined reference to `ath_rate_node_cleanup'
if_ath.o(.text+0x26c4): In function `ath_node_free':
: undefined reference to `ath_rate_node_cleanup'
if_ath.o(.text+0x3929): In function `ath_start':
: undefined reference to `ath_rate_setupxtxdesc'
if_ath.o(.text+0x3b96): In function `ath_start':
: undefined reference to `ath_rate_findrate'
if_ath.o(.text+0x4902): In function `ath_tx_processq':
: undefined reference to `ath_rate_tx_complete'
if_ath.o(.text+0x5261): In function `ath_detach':
: undefined reference to `ath_rate_detach'
if_ath.o(.text+0x5be7): In function `ath_newstate':
: undefined reference to `ath_rate_newstate'
if_ath.o(.text+0x5cd0): In function `ath_newstate':
: undefined reference to `ath_rate_newstate'
if_ath.o(.text+0x60df): In function `ath_newassoc':
: undefined reference to `ath_rate_newassoc'
if_ath.o(.text+0x7ccb): In function `ath_attach':
: undefined reference to `ath_rate_attach'
*** Error code 1

Stop in /usr/obj/usr/src/sys/KERNEL6.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
  
Any ideas how to get rid of this?

-- 
Martin Moeller <andvari at gmx.de>