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Ok after some google search I think this code could work

find_package(OpenCV  OPTIONAL_COMPONENTS xfeatures2d) 
if (OPENCV_XFEATURES2D_FOUND)
    message ("xfeature2d found")
else (OPENCV_XFEATURES2D_FOUND)
    message ("no xfeature2d found")
endif (OPENCV_XFEATURES2D_FOUND)