Making module
make -C /lib/modules/2.6.13-15-default/build SUBDIRS=/home/kaiyuan/vpnclient modules
make[1]: Entering directory `/usr/src/linux-2.6.13-15-obj/i386/default'
make[1]: *** No rule to make target `modules'. Stop.
make[1]: Leaving directory `/usr/src/linux-2.6.13-15-obj/i386/default'
make: *** [default] Error 2
Failed to make module "cisco_ipsec.ko".