/usr/include/psmile.MPI2/ is in liboasis3-dev 3.3.beta.dfsg.1-8build2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/psmile.MPI2/errioipsl_psmile.mod
/usr/include/psmile.MPI2/mathelp_psmile.mod
/usr/include/psmile.MPI2/mod_comprism_proto.mod
/usr/include/psmile.MPI2/mod_gsip_model.mod
/usr/include/psmile.MPI2/mod_kinds_model.mod
/usr/include/psmile.MPI2/mod_kinds_mpp.mod
/usr/include/psmile.MPI2/mod_prism_def_partition_proto.mod
/usr/include/psmile.MPI2/mod_prism_get_comm.mod
/usr/include/psmile.MPI2/mod_prism_get_proto.mod
/usr/include/psmile.MPI2/mod_prism_grids_writing.mod
/usr/include/psmile.MPI2/mod_prism_proto.mod
/usr/include/psmile.MPI2/mod_prism_put_proto.mod
/usr/include/psmile.MPI2/mod_psmile_date_and_time.mod
/usr/include/psmile.MPI2/mod_psmile_io.mod
/usr/include/psmile.MPI2/mod_psmile_io_interfaces.mod
/usr/include/psmile.MPI2/mpp_domains_mod_oa.mod
/usr/include/psmile.MPI2/mpp_io_mod_oa.mod
/usr/include/psmile.MPI2/mpp_mod_oa.mod
/usr/include/psmile.MPI2/stringop_psmile.mod