Error when Trying to Compile Click

Hi, when trying to compile CLICK linux modules under the VCORE-4.4 VM environment, I get the following message:
core@vcore:~/Desktop/click-2.0.1/linuxmodule$ makeecho "linuxmodule  analysis app aqm ethernet icmp ip simple standard tcpudp test threads" | ../click-buildtool findelem -r linuxmodule -p .. -X ./elements.exclude  > elements.conf../click-buildtool elem2make -x "addressinfo.o alignmentinfo.o errorelement.o portinfo.o scheduleinfo.o" < elements.conf > elements.mk  CXX ../lib/string.ccIn file included from ../include/click/atomic.hh:5:0,                 from ../include/click/string.hh:5,                 from ../lib/string.cc:22:../include/click/glue.hh:25:27: fatal error: linux/skbuff.h: No such file or directorycompilation terminated.make: *** [string.o] Error 1
Not sure why there's a missing header problem. Any help would be greatly appreciated. Note that when compiling from the main directory "click-2.0.1", there are no errors, but the click-install command does not work.
Thank you,
Ruolin