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Problem Solved!!!✌️, @LBerger @berak @supra56 thanks all you guys for help. It is because that xfeatures2d requires boostdesc_bgm.i etc, and I have a bad internet connection, so I download them manually, and changed the download link in download_boostdesc.cmake to my local filesystem. However, this causes hash mismatch for those files, so cmake print out warnings and make xfeatures2d unavailable automatically. Everything goes well after I remove that statement that disables xfeatures2d for hash mismatch. Thanks a lot guys!!!(The system says that new users must wait 2 days to answer their own question, so I just leave a comment here.)
