/usr/lib/x86_64-linux-gnu/pkgconfig/ is in libpcl-dev 1.7.2-7.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_io-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_apps-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_in_hand_scanner-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_registration-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_people-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_common-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_search-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_visualization-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_surface-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_tracking-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_sample_consensus-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_kdtree-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_modeler-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_segmentation-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_keypoints-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_octree-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_filters-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_point_cloud_editor-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_outofcore-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_geometry-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_features-1.7.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/pcl_recognition-1.7.pc