[Qtwebengine] error: Unknown module(s) in QT: webenginewidgets

[Nemo]

I have build a static Qt 5.5.1 under unbuntu 14.04 LTS 64-bit, then I build Qt demo "fancybrowser" with new static Qt library, and I found this error. There is no webengine .a file outputed fater static building, and I cannot find webengine option when "./configure --help" in Qt Src directory.
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