[Interest] error with building project that contain webview

[henry cui]

hello
      I met a strange question that I create a default project,and adding a
webview in default UI,and also put "QT += webkit" into project file.and I
still get error prompts that like these:
E:\MyDocuments\test\ui_mainwindow.h:42: 错误:undefined reference to
`_imp___ZN8QWebViewC1EP7QWidget'
E:\MyDocuments\test\ui_mainwindow.h:45: 错误:undefined reference to
`_imp___ZN8QWebView6setUrlERK4QUrl'

I was wondering what 's wrong with it,any one could help me.thanks a lot.

-- 
best,
henry cui
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