How to implement QGLFormat with QGLContext

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What I'd like to know is how pass my QGLFormat object to QGLContext?

When I try to do this:

QGLFormat mFormat = QGLFormat( QGL::DepthBuffer | QGL::AlphaChannel );
 
QGLContext mContext = QGLContext( mFormat );

QGLFormat mFormat = QGLFormat( QGL::DepthBuffer | QGL::AlphaChannel );

QGLContext mContext = QGLContext( mFormat );

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I get this error:

error: 'QGLContext::QGLContext(const QGLContext&)' is private

error: 'QGLContext::QGLContext(const QGLContext&)' is private

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Using Qt Creator with Windows 7.

What is wrong here?