rbrief complilation problems

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I can't get the rbrief package to compile. It seems that the stuff for the orb descriptor is not compiling or it has been disabled in the source code

Essentially the error that I get

scale_study.cpp:(.text+0x30d): undefined reference to cv::ORB::ORB(unsigned long, cv::ORB::CommonParams const&)' scale_study.cpp:(.text+0x324): undefined reference tocv::ORB::operator()(cv::Mat const&, cv::Mat const&, std::vector<cv::keypoint, std::allocator<cv::keypoint=""> >&, cv::Mat&, bool)' scale_study.cpp:(.text+0x32c): undefined reference to cv::ORB::~ORB()' scale_study.cpp:(.text+0x741): undefined reference tocv::ORB::~ORB()'

I'm compiling it against the trunk version of cv