Zaptel 1.4.9.2 won't install

./configure and make both work fine, but when I go to “sudo make install” I get this error. Zaptel 1.4.8 compiles and installs perfectly fine on the exact same system.

$ sudo make install
make[1]: Entering directory `/usr/local/src/zaptel-1.4.9.2'
make -C /lib/modules/2.6.24-gentoo-r4/build SUBDIRS=/kernel HOTPLUG_FIRMWARE=yes KBUILD_OBJ_M="pciradio.o tor2.o torisa.o wcfxo.o wct1xxp.o wctdm.o wcte11xp.o wcusb.o zaptel.o ztd-eth.o ztd-loc.o ztdummy.o ztdynamic.o zttranscode.o wct4xxp/ wctc4xxp/ xpp/ wctdm24xxp/ wcte12xp/" modules
make[2]: Entering directory `/usr/src/linux-2.6.24-gentoo-r4'
scripts/Makefile.build:41: /kernel/Makefile: No such file or directory
make[3]: *** No rule to make target `/kernel/Makefile'.  Stop.
make[2]: *** [_module_/kernel] Error 2
make[2]: Leaving directory `/usr/src/linux-2.6.24-gentoo-r4'
make[1]: *** [modules] Error 2
make[1]: Leaving directory `/usr/local/src/zaptel-1.4.9.2'
make: *** [all] Error 2