/usr/include/sepol/policydb/ is in libsepol1-dev 2.1.0-1.2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sepol/policydb/avrule_block.h
/usr/include/sepol/policydb/avtab.h
/usr/include/sepol/policydb/conditional.h
/usr/include/sepol/policydb/constraint.h
/usr/include/sepol/policydb/context.h
/usr/include/sepol/policydb/ebitmap.h
/usr/include/sepol/policydb/expand.h
/usr/include/sepol/policydb/flask.h
/usr/include/sepol/policydb/flask_types.h
/usr/include/sepol/policydb/hashtab.h
/usr/include/sepol/policydb/hierarchy.h
/usr/include/sepol/policydb/link.h
/usr/include/sepol/policydb/mls_types.h
/usr/include/sepol/policydb/module.h
/usr/include/sepol/policydb/polcaps.h
/usr/include/sepol/policydb/policydb.h
/usr/include/sepol/policydb/services.h
/usr/include/sepol/policydb/sidtab.h
/usr/include/sepol/policydb/symtab.h
/usr/include/sepol/policydb/util.h