Qmake does :

Starting: "d:/qt/2010.04/qt/bin/qmake.exe" d:/c++/plug1/plug1.pro -r -spec win32-g++
The process "d:/qt/2010.04/qt/bin/qmake.exe" exited normally.
And nothing more... (My application is not launched)
Then, if I do click on 'run' project all the building process is launched again with the same errors.