On FreeBSD-9.0-CURRENT while trying ndisgen the following files got created: bus_if.h device_if.h windrv.h and windrv.o and ndisgen echoed an error Code: Generating Makefile... done Building kernel module.. "/usr/share/mk/bsd.kmod.mk", line 12: "can't find kernel source tree" build failed. Exiting. It didn't generate the .ko file I tried compiling source for a driver and I again get the above error. Just wanted to know if this error is because 9.0 kernel is still under development or am I missing th source tree ? is there a pk_add package to install the CURRENT 9.0 source Tree ?