/usr/include/dballe/db/v7/ is in libdballe-dev 7.21-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dballe/db/v7/cursor.h
/usr/include/dballe/db/v7/data.h
/usr/include/dballe/db/v7/db.h
/usr/include/dballe/db/v7/driver.h
/usr/include/dballe/db/v7/internals.h
/usr/include/dballe/db/v7/levtr.h
/usr/include/dballe/db/v7/mysql/
/usr/include/dballe/db/v7/mysql/data.h
/usr/include/dballe/db/v7/mysql/driver.h
/usr/include/dballe/db/v7/mysql/levtr.h
/usr/include/dballe/db/v7/mysql/repinfo.h
/usr/include/dballe/db/v7/mysql/station.h
/usr/include/dballe/db/v7/postgresql/
/usr/include/dballe/db/v7/postgresql/data.h
/usr/include/dballe/db/v7/postgresql/driver.h
/usr/include/dballe/db/v7/postgresql/levtr.h
/usr/include/dballe/db/v7/postgresql/repinfo.h
/usr/include/dballe/db/v7/postgresql/station.h
/usr/include/dballe/db/v7/qbuilder.h
/usr/include/dballe/db/v7/repinfo.h
/usr/include/dballe/db/v7/sqlite/
/usr/include/dballe/db/v7/sqlite/data.h
/usr/include/dballe/db/v7/sqlite/driver.h
/usr/include/dballe/db/v7/sqlite/levtr.h
/usr/include/dballe/db/v7/sqlite/repinfo.h
/usr/include/dballe/db/v7/sqlite/station.h
/usr/include/dballe/db/v7/state.h
/usr/include/dballe/db/v7/station.h
/usr/include/dballe/db/v7/transaction.h