error when compile slusb64bit-2.9.11-20070813

Hi
I'm Debian's user, I want use Aztech UM9800-U USB modem to send fax, when  
i copile slusb64bit i got these


bnamega@bdsp88a:~/Desktop/slusb64bit-2.9.11-20070813$ make
make -C modem all
make[1]: Entering directory  
`/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/modem'
make[1]: Leaving directory  
`/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/modem'
make -C drivers KERNEL_DIR=/lib/modules/2.6.32-5-amd64/build
make[1]: Entering directory  
`/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/drivers'
cc -I/lib/modules/2.6.32-5-amd64/build/include -o kernel-ver kernel-ver.c
make all KERNEL_VER=2.6.32-5-amd64
make[2]: Entering directory  
`/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/drivers'
make modules -C /lib/modules/2.6.32-5-amd64/build  
SUBDIRS=/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/drivers
make[3]: Entering directory `/usr/src/linux-headers-2.6.32-5-amd64'
   Building modules, stage 2.
   MODPOST 1 modules
FATAL: modpost: GPL-incompatible module slusb.ko uses GPL-only symbol  
'usb_unlink_urb'
make[6]: *** [__modpost] Error 1
make[5]: *** [modules] Error 2
make[4]: *** [sub-make] Error 2
make[3]: *** [all] Error 2
make[3]: Leaving directory `/usr/src/linux-headers-2.6.32-5-amd64'
make[2]: *** [all] Error 2
make[2]: Leaving directory  
`/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/drivers'
make[1]: *** [all] Error 2
make[1]: Leaving directory  
`/home/bnamega/Desktop/slusb64bit-2.9.11-20070813/drivers'
make: *** [drivers] Error 2

please help!
thanks.
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