ZTDummy Error

when we use make all command /etc/usr/asterisk/zaptel1.2.6/

we got an error

make[2]: *** [/usr/src/asterisk/zaptel-1.2.6/wcfxsusb.o] Error 1
make[1]: *** [module/usr/src/asterisk/zaptel-1.2.6] Error 2
make[1]: Leaving directory `/usr/src/kernel-headers-2.6.8-3-386’
make: *** [linux26] Error 2

We are using Debian Sarge 3.1 and used all the commands listed in
voip-info.org/wiki-Asterisk+timer+ztdummy

Please advice. Thanks