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In file included from main.cpp:41:
../connection.h:43:24: QSqlDatabase: No such file or directory
../connection.h:44:21: QSqlError: No such file or directory
../connection.h:45:21: QSqlQuery: No such file or directory
In file included from main.cpp:41:
../connection.h: In function `bool createConnection()':
../connection.h:57: error: `QSqlDatabase' undeclared (first use this function)
../connection.h:57: error: (Each undeclared identifier is reported only once for
 each function it appears in.)
../connection.h:57: error: expected `;' before "db"
../connection.h:58: error: `db' undeclared (first use this function)
../connection.h:69: error: `QSqlQuery' undeclared (first use this function)
../connection.h:69: error: expected `;' before "query"
../connection.h:70: error: `query' undeclared (first use this function)
mingw32-make[1]: *** [tmp\obj\release_shared\main.o] Error 1
mingw32-make[1]: Leaving directory `C:/QT/4.3.1/examples/sql/cachedtable'
mingw32-make: *** [release] Error 2

QT+=sql