/usr/include/trilinos/ is in libtrilinos-moertel-dev 12.12.1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/trilinos/Moertel_config.h
/usr/include/trilinos/mrtr_function.H
/usr/include/trilinos/mrtr_functions.H
/usr/include/trilinos/mrtr_integrator.H
/usr/include/trilinos/mrtr_interface.H
/usr/include/trilinos/mrtr_lm_selector.H
/usr/include/trilinos/mrtr_manager.H
/usr/include/trilinos/mrtr_ml_preconditioner.H
/usr/include/trilinos/mrtr_node.H
/usr/include/trilinos/mrtr_overlap.H
/usr/include/trilinos/mrtr_pnode.H
/usr/include/trilinos/mrtr_point.H
/usr/include/trilinos/mrtr_projector.H
/usr/include/trilinos/mrtr_segment.H
/usr/include/trilinos/mrtr_segment_bilinearquad.H
/usr/include/trilinos/mrtr_segment_bilineartri.H
/usr/include/trilinos/mrtr_segment_linear1D.H
/usr/include/trilinos/mrtr_solver.H
/usr/include/trilinos/mrtr_utils.H