/usr/include/libgdamm-5.0/libgdamm/private/ is in libgdamm5.0-dev 4.99.6-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libgdamm-5.0/libgdamm/private/batch_p.h
/usr/include/libgdamm-5.0/libgdamm/private/blob_p.h
/usr/include/libgdamm-5.0/libgdamm/private/blobop_p.h
/usr/include/libgdamm-5.0/libgdamm/private/column_p.h
/usr/include/libgdamm-5.0/libgdamm/private/config_p.h
/usr/include/libgdamm-5.0/libgdamm/private/connection_p.h
/usr/include/libgdamm-5.0/libgdamm/private/connectionevent_p.h
/usr/include/libgdamm-5.0/libgdamm/private/dataaccesswrapper_p.h
/usr/include/libgdamm-5.0/libgdamm/private/datacomparator_p.h
/usr/include/libgdamm-5.0/libgdamm/private/datahandler_p.h
/usr/include/libgdamm-5.0/libgdamm/private/datamodel_p.h
/usr/include/libgdamm-5.0/libgdamm/private/datamodelarray_p.h
/usr/include/libgdamm-5.0/libgdamm/private/datamodelimport_p.h
/usr/include/libgdamm-5.0/libgdamm/private/datamodeliter_p.h
/usr/include/libgdamm-5.0/libgdamm/private/dataproxy_p.h
/usr/include/libgdamm-5.0/libgdamm/private/dataselect_p.h
/usr/include/libgdamm-5.0/libgdamm/private/handlerbin_p.h
/usr/include/libgdamm-5.0/libgdamm/private/handlerboolean_p.h
/usr/include/libgdamm-5.0/libgdamm/private/handlernumerical_p.h
/usr/include/libgdamm-5.0/libgdamm/private/handlerstring_p.h
/usr/include/libgdamm-5.0/libgdamm/private/handlertime_p.h
/usr/include/libgdamm-5.0/libgdamm/private/handlertype_p.h
/usr/include/libgdamm-5.0/libgdamm/private/holder_p.h
/usr/include/libgdamm-5.0/libgdamm/private/metastore_p.h
/usr/include/libgdamm-5.0/libgdamm/private/metastruct_p.h
/usr/include/libgdamm-5.0/libgdamm/private/numeric_p.h
/usr/include/libgdamm-5.0/libgdamm/private/quarklist_p.h
/usr/include/libgdamm-5.0/libgdamm/private/row_p.h
/usr/include/libgdamm-5.0/libgdamm/private/serveroperation_p.h
/usr/include/libgdamm-5.0/libgdamm/private/serverprovider_p.h
/usr/include/libgdamm-5.0/libgdamm/private/set_p.h
/usr/include/libgdamm-5.0/libgdamm/private/sqlbuilder_p.h
/usr/include/libgdamm-5.0/libgdamm/private/sqlexpr_p.h
/usr/include/libgdamm-5.0/libgdamm/private/sqlparser_p.h
/usr/include/libgdamm-5.0/libgdamm/private/sqlstatement_p.h
/usr/include/libgdamm-5.0/libgdamm/private/statement_p.h
/usr/include/libgdamm-5.0/libgdamm/private/transactionstatus_p.h
/usr/include/libgdamm-5.0/libgdamm/private/xatransaction_p.h