Это ужасный совет.
к отладки для проекта, а затем,
Running build steps for project Text_Editor...
Starting: "c:/qt/2010.05/qt/bin/qmake.exe" C:/Qt/2010.05/Text_Editor/Text_Editor.pro -r -spec win32-g++
The process "c:/qt/2010.05/qt/bin/qmake.exe" exited normally.
Starting: "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" -w
mingw32-make: Entering directory `C:/Qt/2010.05/Text_Editor-build-desktop'
C:/Qt/2010.05/mingw/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Qt/2010.05/Text_Editor-build-desktop'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\qt\include\QtCore" -I"..\qt\include\QtGui" -I"..\qt\include" -I"..\qt\include\ActiveQt" -I"debug" -I"..\Text_Editor" -I"." -I"..\qt\mkspecs\win32-g++" -o debug\main.o ..\Text_Editor\main.cpp
mingw32-make[1]: Leaving directory `C:/Qt/2010.05/Text_Editor-build-desktop'
mingw32-make: Leaving directory `C:/Qt/2010.05/Text_Editor-build-desktop'
g++: ..\Text_Editor\main.cpp: No such file or directory
g++: no input files
mingw32-make[1]: *** [debug/main.o] Error 1
mingw32-make: *** [debug] Error 2
The process "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" exited with code %2.
Error while building project Text_Editor (target: Desktop)
When executing build step 'Make'
Я понятия не имею по этому поводу. Я просто установил его, создал новый проект и сразу же получил эту ошибку.