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After a lot of fiddling, I finally found the answer.

I compiled OpenCV without installing the development package for V4L. After I installed the missing library, everything works!

After a lot of fiddling, I finally found the answer.

I compiled OpenCV without installing the development package for V4L. After I installed the missing library, everything works!

P.S. Note to the developers: you could add a sanity check for libv4l-dev if compiling with V4L.