/usr/include/mrpt/obs/ is in libmrpt-dev 1:1.2.2-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mrpt/obs/include/
/usr/include/mrpt/obs/include/mrpt/
/usr/include/mrpt/obs/include/mrpt/obs/
/usr/include/mrpt/obs/include/mrpt/obs.h
/usr/include/mrpt/obs/include/mrpt/obs/link_pragmas.h
/usr/include/mrpt/obs/include/mrpt/obs/obs_frwds.h
/usr/include/mrpt/obs/include/mrpt/slam/
/usr/include/mrpt/obs/include/mrpt/slam/CAction.h
/usr/include/mrpt/obs/include/mrpt/slam/CActionCollection.h
/usr/include/mrpt/obs/include/mrpt/slam/CActionRobotMovement2D.h
/usr/include/mrpt/obs/include/mrpt/slam/CActionRobotMovement3D.h
/usr/include/mrpt/obs/include/mrpt/slam/CMetricMap.h
/usr/include/mrpt/obs/include/mrpt/slam/CMetricMapEvents.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservation.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservation2DRangeScan.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservation3DRangeScan.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservation3DRangeScan_project3D_impl.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservation6DFeatures.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationBatteryState.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationBeaconRanges.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationBearingRange.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationCANBusJ1939.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationComment.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationGPS.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationGasSensors.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationIMU.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationImage.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationOdometry.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationRFID.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationRGBD360.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationRange.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationRawDAQ.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationReflectivity.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationStereoImages.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationStereoImagesFeatures.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationWindSensor.h
/usr/include/mrpt/obs/include/mrpt/slam/CObservationWirelessPower.h
/usr/include/mrpt/obs/include/mrpt/slam/CRawlog.h
/usr/include/mrpt/obs/include/mrpt/slam/CSensoryFrame.h
/usr/include/mrpt/obs/include/mrpt/slam/CSimpleMap.h
/usr/include/mrpt/obs/include/mrpt/slam/CSinCosLookUpTableFor2DScans.h
/usr/include/mrpt/obs/include/mrpt/slam/carmen_log_tools.h