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?