Problem usb_cam: undefined reference to `avcodec_decode_video2' [closed]

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Hi all!

I have this following error messages while doing rosmake for usb_cam package. I'm running Electric on Ubuntu10.04. Thanks before for answering.

Linking CXX executable ../../../bin/usb_cam_node
  ../../../lib/libusb_cam.so: undefined reference to avcodec_decode_video2'
  ../../../lib/libusb_cam.so: undefined reference toav_init_packet'
  collect2: ld returned 1 exit status
  make[3]: * [../bin/usb_cam_node] Error 1