Commercial and LGPL

[bnilsson]

I am making a commercial app using Qt4.5.

If I understand correctly, I can do this under LGPL if I distribute the unmodified Qtcore and Qtgui with the installation and the proper readme's. Is this correct?

I also need the QtSingleApplication class, http://www.qtsoftware.com/products/a...gleapplication.
Do I have to distribute it as a library, or can I compile into my code?
It is tempting to do that since the number of files is small.

I have to say the LGPL license text is not making it easy for the reader!
It seems the more 'legally clear' such a text is, the more difficult it is to understand for us commoners.