/usr/include/mrpt/graphs/ is in libmrpt-dev 1:1.4.0-7.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mrpt/graphs/include/
/usr/include/mrpt/graphs/include/mrpt/
/usr/include/mrpt/graphs/include/mrpt/graphs/
/usr/include/mrpt/graphs/include/mrpt/graphs.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CAStarAlgorithm.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CDirectedGraph.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CDirectedTree.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CGraphPartitioner.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CGraphPartitioner_impl.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CNetworkOfPoses.h
/usr/include/mrpt/graphs/include/mrpt/graphs/CNetworkOfPoses_impl.h
/usr/include/mrpt/graphs/include/mrpt/graphs/dijkstra.h
/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/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/types.h