/usr/include/x86_64-linux-gnu/ is in libvisp-vision-dev 3.0.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/visp3/
/usr/include/x86_64-linux-gnu/visp3/vision/
/usr/include/x86_64-linux-gnu/visp3/vision/vpBasicKeyPoint.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpCalibration.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpCalibrationException.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpFernClassifier.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpHomography.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpKeyPoint.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpKeyPointSurf.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpLevenbergMarquartd.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpPlanarObjectDetector.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpPose.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpPoseException.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpPoseFeatures.h
/usr/include/x86_64-linux-gnu/visp3/vision/vpXmlConfigParserKeyPoint.h