[mcj]Anaconda安装Opencv之后不能用：error: (-2:Unspecified error) The function is not implemented. Rebuild ..-马春杰杰

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利用Anaconda创建了很多需要的环境，有些环境需要opencv的支持，不过直接使用conda安装opencv的话，可能会遇到不能使用的尴尬情况~这是因为conda安装的opencv是阉割版的，功能比较少。甚至连imshow都不能用。会出现下面错误：

(pytorch) ubuntu@mcj:~/mcj/yolo/pytorch-yolo-v3$ python video_demo.py --video  0101.avi
Loading network.....
Network successfully loaded
/home/ubuntu/anaconda3/envs/pytorch/lib/python3.6/site-packages/torch/nn/modules/upsampling.py:129: UserWarning: nn.Upsample is deprecated. Use nn.functional.interpolate instead.
  warnings.warn("nn.{} is deprecated. Use nn.functional.interpolate instead.".format(self.name))
Traceback (most recent call last):
  File "video_demo.py", line 172, in &lt;module&gt;
    cv2.imshow("frame", orig_im)
cv2.error: OpenCV(3.4.2) /tmp/build/80754af9/opencv-suite_1535558553474/work/modules/highgui/src/window.cpp:632: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

(pytorch) ubuntu@mcj:~/mcj/yolo/pytorch-yolo-v3$ python video_demo.py --video 0101.avi

Loading network.....

Network successfully loaded

/home/ubuntu/anaconda3/envs/pytorch/lib/python3.6/site-packages/torch/nn/modules/upsampling.py:129: UserWarning: nn.Upsample is deprecated. Use nn.functional.interpolate instead.

warnings.warn("nn.{} is deprecated. Use nn.functional.interpolate instead.".format(self.name))

Traceback (most recent call last):

File "video_demo.py", line 172, in <module>

cv2.imshow("frame", orig_im)

cv2.error: OpenCV(3.4.2) /tmp/build/80754af9/opencv-suite_1535558553474/work/modules/highgui/src/window.cpp:632: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

解决方法：

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