/usr/include/pcl-1.7/pcl/modeler/ is in libpcl-dev 1.7.2-14build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/pcl-1.7/pcl/modeler/abstract_item.h
/usr/include/pcl-1.7/pcl/modeler/abstract_worker.h
/usr/include/pcl-1.7/pcl/modeler/channel_actor_item.h
/usr/include/pcl-1.7/pcl/modeler/cloud_mesh.h
/usr/include/pcl-1.7/pcl/modeler/cloud_mesh_item.h
/usr/include/pcl-1.7/pcl/modeler/cloud_mesh_item_updater.h
/usr/include/pcl-1.7/pcl/modeler/dock_widget.h
/usr/include/pcl-1.7/pcl/modeler/icp_registration_worker.h
/usr/include/pcl-1.7/pcl/modeler/impl/
/usr/include/pcl-1.7/pcl/modeler/impl/parameter.hpp
/usr/include/pcl-1.7/pcl/modeler/impl/scene_tree.hpp
/usr/include/pcl-1.7/pcl/modeler/main_window.h
/usr/include/pcl-1.7/pcl/modeler/normal_estimation_worker.h
/usr/include/pcl-1.7/pcl/modeler/normals_actor_item.h
/usr/include/pcl-1.7/pcl/modeler/parameter.h
/usr/include/pcl-1.7/pcl/modeler/parameter_dialog.h
/usr/include/pcl-1.7/pcl/modeler/points_actor_item.h
/usr/include/pcl-1.7/pcl/modeler/poisson_worker.h
/usr/include/pcl-1.7/pcl/modeler/qt.h
/usr/include/pcl-1.7/pcl/modeler/render_window.h
/usr/include/pcl-1.7/pcl/modeler/render_window_item.h
/usr/include/pcl-1.7/pcl/modeler/scene_tree.h
/usr/include/pcl-1.7/pcl/modeler/statistical_outlier_removal_worker.h
/usr/include/pcl-1.7/pcl/modeler/surface_actor_item.h
/usr/include/pcl-1.7/pcl/modeler/thread_controller.h
/usr/include/pcl-1.7/pcl/modeler/voxel_grid_downsample_worker.h