Hello budulay
Yes, I made a typo, sorry

Thx for finding it for me.
I ran the command again, and good things happend - for a short while. Here's the looong output:
Vector://usr/src/acx-20080210
root:# make -C /lib/modules/`uname -r`/build M=`pwd`
make: Entering directory `/usr/src/linux-2.6.27.12'
LD /usr/src/acx-20080210/built-in.o
CC [M] /usr/src/acx-20080210/wlan.o
CC [M] /usr/src/acx-20080210/conv.o
CC [M] /usr/src/acx-20080210/ioctl.o
/usr/src/acx-20080210/ioctl.c: In function 'acx_s_scan_add_station':
/usr/src/acx-20080210/ioctl.c:506: warning: passing argument 1 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:506: warning: passing argument 3 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:506: warning: passing argument 4 of 'iwe_stream_add_event' makes pointer from integer without a cast
/usr/src/acx-20080210/ioctl.c:506: error: too few arguments to function 'iwe_stream_add_event'
/usr/src/acx-20080210/ioctl.c:513: warning: passing argument 1 of 'iwe_stream_add_point' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:513: warning: passing argument 3 of 'iwe_stream_add_point' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:513: warning: passing argument 4 of 'iwe_stream_add_point' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:513: error: too few arguments to function 'iwe_stream_add_point'
/usr/src/acx-20080210/ioctl.c:523: warning: passing argument 1 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:523: warning: passing argument 3 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:523: warning: passing argument 4 of 'iwe_stream_add_event' makes pointer from integer without a cast
/usr/src/acx-20080210/ioctl.c:523: error: too few arguments to function 'iwe_stream_add_event'
/usr/src/acx-20080210/ioctl.c:531: warning: passing argument 1 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:531: warning: passing argument 3 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:531: warning: passing argument 4 of 'iwe_stream_add_event' makes pointer from integer without a cast
/usr/src/acx-20080210/ioctl.c:531: error: too few arguments to function 'iwe_stream_add_event'
/usr/src/acx-20080210/ioctl.c:549: warning: passing argument 1 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:549: warning: passing argument 3 of 'iwe_stream_add_event' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:549: warning: passing argument 4 of 'iwe_stream_add_event' makes pointer from integer without a cast
/usr/src/acx-20080210/ioctl.c:549: error: too few arguments to function 'iwe_stream_add_event'
/usr/src/acx-20080210/ioctl.c:559: warning: passing argument 1 of 'iwe_stream_add_point' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:559: warning: passing argument 3 of 'iwe_stream_add_point' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:559: warning: passing argument 4 of 'iwe_stream_add_point' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:559: error: too few arguments to function 'iwe_stream_add_point'
/usr/src/acx-20080210/ioctl.c:574: warning: passing argument 1 of 'iwe_stream_add_value' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:574: warning: passing argument 4 of 'iwe_stream_add_value' from incompatible pointer type
/usr/src/acx-20080210/ioctl.c:574: warning: passing argument 5 of 'iwe_stream_add_value' makes pointer from integer without a cast
/usr/src/acx-20080210/ioctl.c:574: error: too few arguments to function 'iwe_stream_add_value'
make[1]: *** [/usr/src/acx-20080210/ioctl.o] Error 1
make: *** [_module_/usr/src/acx-20080210] Error 2
make: Leaving directory `/usr/src/linux-2.6.27.12'
Vector://usr/src/acx-20080210
root:#