/usr/include/qt5/QtSql/ is in qtbase5-dev 5.2.1+dfsg-1ubuntu14.3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/qt5/QtSql/QSql
/usr/include/qt5/QtSql/QSqlDatabase
/usr/include/qt5/QtSql/QSqlDriver
/usr/include/qt5/QtSql/QSqlDriverCreator
/usr/include/qt5/QtSql/QSqlDriverCreatorBase
/usr/include/qt5/QtSql/QSqlDriverPlugin
/usr/include/qt5/QtSql/QSqlError
/usr/include/qt5/QtSql/QSqlField
/usr/include/qt5/QtSql/QSqlIndex
/usr/include/qt5/QtSql/QSqlQuery
/usr/include/qt5/QtSql/QSqlQueryModel
/usr/include/qt5/QtSql/QSqlRecord
/usr/include/qt5/QtSql/QSqlRelation
/usr/include/qt5/QtSql/QSqlRelationalDelegate
/usr/include/qt5/QtSql/QSqlRelationalTableModel
/usr/include/qt5/QtSql/QSqlResult
/usr/include/qt5/QtSql/QSqlTableModel
/usr/include/qt5/QtSql/QtSql
/usr/include/qt5/QtSql/QtSqlDepends
/usr/include/qt5/QtSql/QtSqlVersion
/usr/include/qt5/QtSql/qsql.h
/usr/include/qt5/QtSql/qsqldatabase.h
/usr/include/qt5/QtSql/qsqldriver.h
/usr/include/qt5/QtSql/qsqldriverplugin.h
/usr/include/qt5/QtSql/qsqlerror.h
/usr/include/qt5/QtSql/qsqlfield.h
/usr/include/qt5/QtSql/qsqlindex.h
/usr/include/qt5/QtSql/qsqlquery.h
/usr/include/qt5/QtSql/qsqlquerymodel.h
/usr/include/qt5/QtSql/qsqlrecord.h
/usr/include/qt5/QtSql/qsqlrelationaldelegate.h
/usr/include/qt5/QtSql/qsqlrelationaltablemodel.h
/usr/include/qt5/QtSql/qsqlresult.h
/usr/include/qt5/QtSql/qsqltablemodel.h
/usr/include/qt5/QtSql/qtsqlversion.h