/usr/include/lqr-1/ is in liblqr-1-0-dev 0.4.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/lqr-1/lqr/
/usr/include/lqr-1/lqr.h
/usr/include/lqr-1/lqr/lqr_base.h
/usr/include/lqr-1/lqr/lqr_carver_bias_pub.h
/usr/include/lqr-1/lqr/lqr_carver_list_pub.h
/usr/include/lqr-1/lqr/lqr_carver_pub.h
/usr/include/lqr-1/lqr/lqr_carver_rigmask_pub.h
/usr/include/lqr-1/lqr/lqr_cursor_pub.h
/usr/include/lqr-1/lqr/lqr_energy_pub.h
/usr/include/lqr-1/lqr/lqr_gradient_pub.h
/usr/include/lqr-1/lqr/lqr_progress_pub.h
/usr/include/lqr-1/lqr/lqr_rwindow_pub.h
/usr/include/lqr-1/lqr/lqr_vmap_list_pub.h
/usr/include/lqr-1/lqr/lqr_vmap_pub.h