It can be easier to setup Qt for the first time if you use the Qt SDK 5.0.2 to install QtCreator and MinGW at the same time with all the paths and so setup nicely. You can get it from this page:
downloads [qt-project.org]
But assuming that your install is ok (which it may not be) how is your project setup? Is it a console project or a GUI project?
Can you copy/paste your .pro file (this is the project file, probably called build-test.pro in your case)…
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