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with opencv 4.1.0, parts of the deprecated c-api were removed, and those tools (which unfortunately heavily relied on it) can no more be built.

note, that training / using cascades also has been superseeded by cnn methods like ssd, which are much faster.

if you really need those cascade tools, you have to checkout the opencv 3.4 branch (any version of it), and build opencv with :

 cmake -DBUILD_opencv_apps=ON