python程序导入cv2包时报错,version `GLIBCXX_3.4.21' not found

ImportError: /home/zhao/anaconda2/bin/../lib/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/zhao/anaconda2/lib/python2.7/site-packages/cv2.so)

gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)

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