Quote Originally Posted by messifanboy View Post
then I do qmake yellow.cpp and then i get those errors
This is the problem.
You doesn't need to do that. Your 1st and second step was fine. So now your steps shall be.
1. "QMake -poject" (To generate .pro file)
2. "QMake" (To generate make files)
3. "nmake" (To build the project with Microsoft compiler)