make编译，提示undeclared (first use this function)错误

我按照手册上第三章步骤做QT应用程序，到make编译这一步时，编译未成功，提示如下：
[root@localhost first]# make
g++ -c -pipe -DQWS -fno-exceptions -fno-rtti -Wall -W -O2 -DNO_DEBUG -I/usr/lib/qt-3.1/include -I/include -o first.o first.cpp
first.cpp: In constructor `first::first(QWidget*, const char*, unsigned int)':
first.cpp:49: `PixmapLabel1' undeclared (first use this function)
first.cpp:49: (Each undeclared identifier is reported only once for each
   function it appears in.)
first.cpp:51: `image0' undeclared (first use this function)
make: *** [first.o] Error 1
似乎是提示PixmapLabel1未定义，但是first.cpp中明明已定义，请管理员帮忙，谢谢！

first.cpp的源码如下：
#include "first.h"

#include <qlabel.h>
#include <qpushbutton.h>
#include <qlayout.h>
#include <qvariant.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <qimage.h>
#include <qpixmap.h>

/*
*  Constructs a first which is a child of 'parent', with the
*  name 'name' and widget flags set to 'f'
*/
first::first( QWidget* parent,  const char* name, WFlags fl )
    : QWidget( parent, name, fl )
{
    if ( !name )
        setName( "first" );
    resize( 451, 305 );
    setCaption( tr( "EmbedSky_First_Qt_Program" ) );

    /*close = new QPushButton( this, "close" );
    close->setGeometry( QRect( 230, 160, 90, 32 ) );
    close->setText( tr( "Close" ) );*/

    user_b = new QPushButton( this, "user_b" );
    user_b->setGeometry( QRect( 60, 20, 100, 30 ) );
    user_b->setText( tr( "User Button" ) );

    user_t = new QLabel( this, "user_t" );
    user_t->setGeometry( QRect( 20, 70, 188, 30 ) );
    QFont user_t_font(  user_t->font() );
    /*user_t_font.setFamily( "adobe-helvetica" );*/
    user_t_font.setPointSize( 18 );
    user_t_font.setBold( TRUE );
    user_t->setFont( user_t_font );
    user_t->setText( tr( "" ) );

    PixmapLabel1=new QLabel(this,"PixmapLabel");
    PixmapLabel1->setGeometry(QRect(260,20,28,98));
    PixmapLabel1->setPixmap(image0);
    PixmapLabel1->setScaledContents(TRUE);

    close = new QPushButton( this, "close" );
    close->setGeometry( QRect( 120, 140, 80, 28 ) );
    close->setText( tr( "Close" ) );

    // signals and slots connections
    connect( user_b, SIGNAL( clicked() ), this, SLOT( user_button() ) );
    connect( close, SIGNAL( clicked() ), this, SLOT( close() ) );
}

/*  
*  Destroys the object and frees any allocated resources
*/
first::~first()
{
    // no need to delete child widgets, Qt does it all for us
}

/*  
*  Main event handler. Reimplemented to handle application
*  font changes
*/
bool first::event( QEvent* ev )
{
    bool ret = QWidget::event( ev );
    if ( ev->type() == QEvent::ApplicationFontChange ) {
        QFont user_t_font(  user_t->font() );
        /*user_t_font.setFamily( "adobe-helvetica" );*/
        user_t_font.setPointSize( 18 );
        user_t_font.setBold( TRUE );
        user_t->setFont( user_t_font );
    }
    return ret;
}

void first::user_button()
{
    user_t->setText(tr("Hello,Qt Application!"));
    //qWarning( "first::user_button(): Not implemented yet!" );
}

1、不要重复发帖。
2、去掉源码中的这几行：
   PixmapLabel1=new QLabel(this,"PixmapLabel");
    PixmapLabel1->setGeometry(QRect(260,20,28,98));
    PixmapLabel1->setPixmap(image0);
    PixmapLabel1->setScaledContents(TRUE);