C++ e qt4

[<TheShop>Evoc Thurner]

ho buttato giù seguendo una guida le seguenti righe:

#include <qt4/QtGui/QApplication>
#include <qt4/QtGui/QLabel>

int main(int argc, char ** argv){
  QApplication app(argc,argv);
  QLabel *label = new QLabel("Hello Qt!");
  label->show();
  return app.exec();
}

che però compilando come segue:

g++ prova_qt4_1.cpp -o prova1

da i seguenti errori:

In file included from /usr/include/qt4/QtGui/QApplication:1,
                 from prova_qt4_1.cpp:1:
/usr/include/qt4/QtGui/qapplication.h:42:37: error: QtCore/qcoreapplication.h: Nessun file o directory
/usr/include/qt4/QtGui/qapplication.h:43:31: error: QtGui/qwindowdefs.h: Nessun file o directory
/usr/include/qt4/QtGui/qapplication.h:44:27: error: QtCore/qpoint.h: Nessun file o directory
/usr/include/qt4/QtGui/qapplication.h:45:26: error: QtCore/qsize.h: Nessun file o directory
/usr/include/qt4/QtGui/qapplication.h:46:27: error: QtGui/qcursor.h: Nessun file o directory
In file included from /usr/include/qt4/QtGui/QLabel:1,
                 from prova_qt4_1.cpp:2:
/usr/include/qt4/QtGui/qlabel.h:42:26: error: QtGui/qframe.h: Nessun file o directory
/usr/include/qt4/QtGui/qapplication.h:59: error: ‘QT_BEGIN_HEADER’ does not name a type
/usr/include/qt4/QtGui/qapplication.h:79: error: invalid function declaration
/usr/include/qt4/QtGui/qapplication.h:358: error: ‘QT_END_HEADER’ does not name a type
/usr/include/qt4/QtGui/qlabel.h:50: error: invalid function declaration
prova_qt4_1.cpp:4: error: expected constructor, destructor, or type conversion before ‘int’

mi potete aiutare?
Sono su Gnu/linux Ubuntu

[devilheart]

devi usare le opzioni -I e -L per dire al compilatore dove trovare rispettivamente gli header e le librerie di qt. ti consiglio vivamente di usare qmake e make