In Opencvcore algorithm header file not found while compiling

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Hi!
Trying to compile the opencv facedetect.cpp sample file in BeagleBoard
Rev. C5. Have installed the required libc6 and cpp compilers via
offline opkg. We always get the error:

"In file included from /usr/include/opencv2/objdetect/objdetect.hpp:
46:0, from find_obj.cpp:7:/usr/include/opencv2/core/core.hpp:56:21:
Fatal error: algorithm: No such file or directory.
Compilation terminated."

Could somebody help us out with this.

Thanks