errorin installation in ztdummy

We installed ztdummy in debian 3.1(sarge), i have kernel 2.6.8-3-386

we get an error regarding Asterisk timer ztdummy

debian:/usr/src/asterisk/zaptel-1.2.6#  make linux26
ZAPTELVERSION="1.2.6" build_tools/make_version_h > version.h.tmp
if cmp -s version.h.tmp version.h ; then echo; else \
        mv version.h.tmp version.h ; \
fi

rm -f version.h.tmp
/lib/modules/2.6.8-3-386/build
make -C /lib/modules/2.6.8-3-386/build SUBDIRS=/usr/src/asterisk/zaptel-1.2.6 modules
make[1]: Entering directory `/usr/src/kernel-headers-2.6.8-3-386'
make[1]: Makefile: No such file or directory
make[1]: *** No rule to make target `Makefile'.  Stop.
make[1]: Leaving directory `/usr/src/kernel-headers-2.6.8-3-386'
make: *** [linux26] Error 2
debian:/usr/src/asterisk/zaptel-1.2.6#  make linux26
ZAPTELVERSION="1.2.6" build_tools/make_version_h > version.h.tmp
if cmp -s version.h.tmp version.h ; then echo; else \
        mv version.h.tmp version.h ; \
fi

rm -f version.h.tmp
/lib/modules/2.6.8-3-386/build
make -C /lib/modules/2.6.8-3-386/build SUBDIRS=/usr/src/asterisk/zaptel-1.2.6 modules
make[1]: Entering directory `/usr/src/kernel-headers-2.6.8-3-386'
make[1]: Makefile: No such file or directory
make[1]: *** No rule to make target `Makefile'.  Stop.
make[1]: Leaving directory `/usr/src/kernel-headers-2.6.8-3-386'
make: *** [linux26] Error 2

thanks in advance
Rohit