/usr/include/qt4/QtSql/ is in libqt4-dev 4:4.8.7+dfsg-5ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/qt4/QtSql/QDB2Driver
/usr/include/qt4/QtSql/QDB2Result
/usr/include/qt4/QtSql/QIBaseDriver
/usr/include/qt4/QtSql/QIBaseResult
/usr/include/qt4/QtSql/QMYSQLDriver
/usr/include/qt4/QtSql/QMYSQLResult
/usr/include/qt4/QtSql/QOCIDriver
/usr/include/qt4/QtSql/QOCIResult
/usr/include/qt4/QtSql/QODBCDriver
/usr/include/qt4/QtSql/QODBCResult
/usr/include/qt4/QtSql/QPSQLDriver
/usr/include/qt4/QtSql/QPSQLResult
/usr/include/qt4/QtSql/QSQLite2Driver
/usr/include/qt4/QtSql/QSQLite2Result
/usr/include/qt4/QtSql/QSQLiteDriver
/usr/include/qt4/QtSql/QSQLiteResult
/usr/include/qt4/QtSql/QSqlDatabase
/usr/include/qt4/QtSql/QSqlDriver
/usr/include/qt4/QtSql/QSqlDriverCreator
/usr/include/qt4/QtSql/QSqlDriverCreatorBase
/usr/include/qt4/QtSql/QSqlDriverFactoryInterface
/usr/include/qt4/QtSql/QSqlDriverPlugin
/usr/include/qt4/QtSql/QSqlError
/usr/include/qt4/QtSql/QSqlField
/usr/include/qt4/QtSql/QSqlIndex
/usr/include/qt4/QtSql/QSqlQuery
/usr/include/qt4/QtSql/QSqlQueryModel
/usr/include/qt4/QtSql/QSqlRecord
/usr/include/qt4/QtSql/QSqlRelation
/usr/include/qt4/QtSql/QSqlRelationalDelegate
/usr/include/qt4/QtSql/QSqlRelationalTableModel
/usr/include/qt4/QtSql/QSqlResult
/usr/include/qt4/QtSql/QSqlTableModel
/usr/include/qt4/QtSql/QSymSQLDriver
/usr/include/qt4/QtSql/QSymSQLResult
/usr/include/qt4/QtSql/QTDSDriver
/usr/include/qt4/QtSql/QTDSResult
/usr/include/qt4/QtSql/QtSql
/usr/include/qt4/QtSql/qsql.h
/usr/include/qt4/QtSql/qsql_db2.h
/usr/include/qt4/QtSql/qsql_ibase.h
/usr/include/qt4/QtSql/qsql_mysql.h
/usr/include/qt4/QtSql/qsql_oci.h
/usr/include/qt4/QtSql/qsql_odbc.h
/usr/include/qt4/QtSql/qsql_psql.h
/usr/include/qt4/QtSql/qsql_sqlite.h
/usr/include/qt4/QtSql/qsql_sqlite2.h
/usr/include/qt4/QtSql/qsql_symsql.h
/usr/include/qt4/QtSql/qsql_tds.h
/usr/include/qt4/QtSql/qsqldatabase.h
/usr/include/qt4/QtSql/qsqldriver.h
/usr/include/qt4/QtSql/qsqldriverplugin.h
/usr/include/qt4/QtSql/qsqlerror.h
/usr/include/qt4/QtSql/qsqlfield.h
/usr/include/qt4/QtSql/qsqlindex.h
/usr/include/qt4/QtSql/qsqlquery.h
/usr/include/qt4/QtSql/qsqlquerymodel.h
/usr/include/qt4/QtSql/qsqlrecord.h
/usr/include/qt4/QtSql/qsqlrelationaldelegate.h
/usr/include/qt4/QtSql/qsqlrelationaltablemodel.h
/usr/include/qt4/QtSql/qsqlresult.h
/usr/include/qt4/QtSql/qsqltablemodel.h