Opencv fatal error: CV. H: no such file or directory when LEGO loam package is compiled recently

Through investigation, I found that my own Ubuntu 18.04 is installed with opencv4, the path is usr/include/opencv4, and opencv4 does not have cv. H

Solutions:

Method 1: install opencv3.4.1,

Method 2: Replace cv. H with imgproc.HPP

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