qvbox.h”: No such file or directory

在QT4的编译环境中编译《Qt入门教程》第三章 家庭价值时候，出现qvbox.h”: No such file or directory

The QVBox class is now only available as Q3VBox in Qt
4. You can achieve the same result as QVBox by creating a QWidget with
a vertical layout:

网上是这样解决的：

#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <qboxlayout.h>

int main( int argc, char **argv )
{
QApplication a( argc, argv );

QWidget window;               //定义一窗口
window.resize(200,120);    	  //窗口大小

QVBoxLayout layout;           //竖着排设计类

QPushButton quit( "Quit", &window );               //退出按钮
quit.setFont( QFont( "Times", 18, QFont::Bold ) ); //字体

// 按钮按下既是退出信号
QObject::connect( &quit, SIGNAL(clicked()), &a, SLOT(quit()) );

layout.addWidget(&quit);               //

window.setLayout(&layout);             //
window.show();

return a.exec();
}