I finally managed to compile...
In the project, i had to add the Kit Destop (Combo Add Kit in project) (don't know why the destop autodtected doesn't work but that's fine with me if Destop works).
I added my Qt Path for INCLUDE, LIBPATH AND LIB.
Moreother, it seems there are changes in Qt5.0 ;-) i mean, i had to add QT+= widgets in the .pro file.
QtGui/QApplication become QtWidget/QApplication and i'm just at the beginning...
But, yes, QtCreator compiles something !!!YPOUOUHH WHAT A NIGHTMARE!!!!