关于在Freebsd9.0-amd64安装VirtualBox虚拟机的问题

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   # portsnap fetch update
   # cd /usr/ports/emulators/virtualbox-ose
   # make install clean

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   pass -build programs
   pass -Libraries
   pass -DLLs
   pass -Programs
   Pass - install
   kmk:*** NoRULE to make target '/usr/src/sys/kern/bus_if.m',needed by
   '/usr/ports/emulators/virtualbox-ose/work/virtualbox-4.0.14_OSE/out/fre
   ebsd.amd64/release/obj/freebsdgeneratedkernelheaders/bus_if.h. Stop
   *** error code 2
   Stop in /usr/ports/emulators/virtualbox-ose.
   *** Error code 1
   Stop in /usr/ports/emulators/virtualbox-ose.
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