DecenWill

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You should build opencv with OpenGL, and cmake with following command "OpenCV_DIR=you/opencv/build/ cmake .."

I fixed it. :) ![h0b1flst1ty z6h_ a0s 65](https://user-images.githubusercontent.com/22345770/40786962-fa8a837a-651e-11e8-9e32-374129d24a1b.png)