error building madwifi-ng modules

[digger vermont]

Hello All,

I'm trying to build madwifi-ng modules from svn.  It's quitting with
this error:

make[2]: Entering directory `/usr/src/linux-headers-2.6.15-20-powerpc'
  CC [M]  /home/digger/src/SVN/madwifi-ng/ath_rate/sample/sample.o
  LD
[M]  /home/digger/src/SVN/madwifi-ng/ath_rate/sample/ath_rate_sample.o
  Building modules, stage 2.
  MODPOST
  LD
[M]  /home/digger/src/SVN/madwifi-ng/ath_rate/sample/ath_rate_sample.ko
make[2]: Leaving directory `/usr/src/linux-headers-2.6.15-20-powerpc'
make[1]: Leaving directory
`/home/digger/src/SVN/madwifi-ng/ath_rate/sample'
make[1]: Entering directory `/home/digger/src/SVN/madwifi-ng/ath'
make -C /lib/modules/2.6.15-20-powerpc/build
SUBDIRS=/home/digger/src/SVN/madwifi-ng/ath
MODVERDIR=/home/digger/src/SVN/madwifi-ng/ath/../symbols modules
make[2]: Entering directory `/usr/src/linux-headers-2.6.15-20-powerpc'
  CC [M]  /home/digger/src/SVN/madwifi-ng/ath/if_ath.o
cc1: warnings being treated as errors
In file included from include/asm/machdep.h:13,
                 from include/asm/pci.h:17,
                 from include/linux/pci.h:581,

from /home/digger/src/SVN/madwifi-ng/ath/if_ath_pci.h:43,
                 from /home/digger/src/SVN/madwifi-ng/ath/if_ath.c:84:
include/linux/seq_file.h:43: warning: 'printk' is an unrecognized format
function type
make[3]: *** [/home/digger/src/SVN/madwifi-ng/ath/if_ath.o] Error 1
make[2]: *** [_module_/home/digger/src/SVN/madwifi-ng/ath] Error 2
make[2]: Leaving directory `/usr/src/linux-headers-2.6.15-20-powerpc'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/digger/src/SVN/madwifi-ng/ath'
make: *** [modules] Error 1

Seems like it must be something simple though I haven't been able to
figure it out.

I'm on a powerpc using an up-to-date dapper.  I have these pkg's
installed:

ii  linux-headers-2.6.15-20           2.6.15-20.30 
ii  linux-headers-2.6.15-20-powerpc   2.6.15-20.30
ii  linux-headers-powerpc             2.6.15.19
ii  sharutils                         4.2.1-15
ii  build-essential                   11.1

Any help or hints are appreciated.

Thanks,

digger