<p>Since there are lots of submodules, this might take a few minutes</p>
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<p>The flag <code>-DIMMVISION_FETCH_OPENCV=ON</code> is optional. If set, a minimal version of OpenCV will be downloaded a compiled at this stage (this might require a few minutes)</p>
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<p>The <code>immvision</code> module will only be built if OpenCV can be found. Otherwise, it will be ignored, and no error will be emitted.</p>
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