/usr/include/mrpt/graphslam/ is in libmrpt-dev 1:1.5.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mrpt/graphslam/include/
/usr/include/mrpt/graphslam/include/mrpt/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/
/usr/include/mrpt/graphslam/include/mrpt/graphslam.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/CGraphSlamEngine.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/CGraphSlamEngine_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/ERD/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/ERD/CEmptyERD.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/ERD/CICPCriteriaERD.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/ERD/CICPCriteriaERD_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/ERD/CLoopCloserERD.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/ERD/CLoopCloserERD_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/GSO/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/GSO/CEmptyGSO.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/GSO/CLevMarqGSO.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/GSO/CLevMarqGSO_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/NRD/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/NRD/CEmptyNRD.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/NRD/CFixedIntervalsNRD.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/NRD/CFixedIntervalsNRD_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/NRD/CICPCriteriaNRD.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/NRD/CICPCriteriaNRD_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/apps_related/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/apps_related/CGraphSlamHandler.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/apps_related/CGraphSlamHandler_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/apps_related/TUserOptionsChecker.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/apps_related/TUserOptionsChecker_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CEdgeRegistrationDecider.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CEdgeRegistrationDecider_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CGraphSlamOptimizer.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CNodeRegistrationDecider.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CNodeRegistrationDecider_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CRangeScanEdgeRegistrationDecider.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CRangeScanEdgeRegistrationDecider_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CRegistrationDeciderOrOptimizer.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/interfaces/CRegistrationDeciderOrOptimizer_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/levmarq.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/levmarq_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/link_pragmas.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/CEdgeCounter.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/CRangeScanOps.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/CRangeScanOps_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/CWindowManager.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/CWindowObserver.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/TNodeProps.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/TSlidingWindow.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/TUncertaintyPath.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/misc/TUncertaintyPath_impl.h
/usr/include/mrpt/graphslam/include/mrpt/graphslam/types.h