madwifi compile error

[krismanto]

os:centos
kernel:2.6.9-67.0.4.plus.c4
board:intel pentium 4 i686
make -C src/madwifi-dfs-r3319-20080201
make[1]: Entering directory `/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201'
Checking requirements... ok.
Checking kernel configuration... ok.
make -C /lib/modules/2.6.9-67.0.4.plus.c4/build SUBDIRS=/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201 modules
make[2]: Entering directory `/usr/src/kernels/2.6.9-67.0.4.plus.c4-i686'
CC [M] /root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201/ath/if_ath.o
In file included from include/linux/slab.h:15,
from include/linux/percpu.h:4,
from include/linux/sched.h:31,
from include/linux/module.h:10,
from /root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201/ath/if_ath.c:53:
include/linux/gfp.h:137: error: conflicting types for 'gfp_t'
/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201/ath/../include/compat.h:133: error: previous declaration of 'gfp_t' was here
make[4]: *** [/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201/ath/if_ath.o] Error 1
make[3]: *** [/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201/ath] Error 2
make[2]: *** [_module_/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201] Error 2
make[2]: Leaving directory `/usr/src/kernels/2.6.9-67.0.4.plus.c4-i686'
make[1]: *** [modules] Error 2
make[1]: Leaving directory `/root/ubnt/ubnt-hal-0.6.280/src/madwifi-dfs-r3319-20080201'
make: *** [build] Error 2

can u help me??
thanks