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with opencv4, a lot of c-api code was removed, and thus the traincascade app does no more build.

(it's not your cmdline or pkg configuration, it's just impossible atm)

you might:

• try to train a HOGDetector instead (similar quality, but similar problems, too)

• look into more modern object detection cnns, like yolo, SSD, squeezenet

• fall back to opencv3.4, where you still can build the cascade training tools properly