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I am using opencv to do color identification. It can be successfully run when I connect the Pi to a display.

But when I use a VNC to connect to the Pi and run that program it hinted:

Xlib: extension “RANDR” missing on display “:1.0”  
(video1812): GdkGLExt -WARNING **:window system doesn't support OpenGL

Then the program stopped. I think maybe I am missing some OpenGL lib, but I don't know which one and how to install it. How can I fix this problem?

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