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If anybody is interested I successfully compiled Qt 5.1 and Qt Creator with MinGW both 32 and 64 bits architectures on Windows 7 64 bits + MSYS.
All detailed instructions here: http://www.kineticsystem.org/mingw
omg you are the bomb! I was looking for this!
Did you compile qt5 using mingw64 bit by setting the configure flag -opengl to desktop, as in:
./configure.exe -opengl desktop