[Qt-creator] Simple qt 5 question

[Phil]

Thank you for reading this.

It's been many years since I've used QT Creator. I have a .pro file that 
I've downloaded but it won't compile and the error message says that 
qt5.2+ is required, I have both qt4 and qt5 installed. How do I let QT 
Creator know that the .pro file needs to be complied with qt5 and not 
default to qt4?

I'm trying to compile this file on a Kubuntu 14.04 system.
QT Creator 3.0.1, QT 5.2.1 and GCC 4.8.2.

PS:
Under "Build & Run" I notice that qmake 4 is the default. I tried to add 
qmake 5 but it fails with "No qmlviewer installed". I have Qt 4 QML 
viewer installed and there isn't qt 5 QML viewer to install.

-- 
Regards,
Phil