Просто Gui приложение валится с такой ошибкой
Полный стек
/usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf
make[1]: Entering directory `/d/Develop/С++/WorkSpace/QtApplication_1'
/C/Qt/2010.05/qt/qmake/qmake.exe VPATH=. -o qttmp-Debug.mk nbproject/qt-Debug.pro
mv -f qttmp-Debug.mk nbproject/qt-Debug.mk
/usr/bin/make -f nbproject/qt-Debug.mk dist/Debug/MinGW-Windows/QtApplication_1.exe
make[2]: Entering directory `/d/Develop/С++/WorkSpace/QtApplication_1'
main.cpp:8:30: error: QtGui/QApplication: No such file or directory
main.cpp: In function 'int main(int, char**)':
main.cpp:15: error: 'QApplication' was not declared in this scope
main.cpp:15: error: expected ';' before 'app'
main.cpp:19: error: 'app' was not declared in this scope
make[2]: *** [build/Debug/MinGW-Windows/main.o] Error 1
make[2]: Leaving directory `/d/Develop/С++/WorkSpace/QtApplication_1'
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory `/d/Develop/С++/WorkSpace/QtApplication_1'
make: *** [.build-impl] Error 2
ПОСТРОИТЬ FAILED (значение выхода 2, общее время: 1с)
Показывает что нету QtGui/QApplication, но он есть
P.S.
IDE NetBeans
qt-sdk-win-opensource-2010.05