错误:找不到体系结构x86_64的符号，collect2:ld返回1退出状态

我已经为Qt上的一个问题挣扎了一段时间。

这是我的代码：

hexbutton.h:

#ifndef HEXBUTTON_H
#define HEXBUTTON_H
#include <QPushButton>
#include <QWidget>
#include <QIcon>
class HexButton : public QPushButton
{
    Q_OBJECT
public:
    HexButton(QWidget *parent, QIcon &icon, int i, int j);
public slots:
    void changeIcon();
};
#endif // HEXBUTTON_H

Hextutton.cpp:

#include "hexbutton.h"
HexButton::HexButton(QWidget *parent, QIcon &icon, int i , int j) : QPushButton(parent){
    //setFlat(true);
    setIcon(icon);
    setGeometry((i*40)+((j*40)/2), j*40, 40, 40);
}
void HexButton::changeIcon(){
        setIcon(QIcon("/Users/jonathanbibas/Documents/Workspace Qt/Test/hexagon.gif"));
}

MyWindow.h:

#ifndef MYWINDOW_H
#define MYWINDOW_H
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QLCDNumber>
#include <QSlider>
#include <QProgressBar>
#include "hexbutton.h"

class MyWindow : public QWidget
{
public:
    MyWindow();
    ~MyWindow();
private:
    HexButton * myButtons[11][11];
};

#endif // MYWINDOW_H

MyWindow.cpp:

#include "MyWindow.h"
#include <QColor>
#include <QIcon>

MyWindow::MyWindow() : QWidget() {

    setFixedSize(740, 440);
    QIcon icon = QIcon("/Users/jonathanbibas/Documents/Workspace Qt/Test/whitehexagon.png");
    for(int i =0 ; i < 11 ; i ++){
        for(int j =0 ; j < 11 ; j ++){

            myButtons[i][j] = new HexButton(this, icon, i, j);
            QObject::connect(myButtons[i][j], SIGNAL(clicked()), myButtons[i][j], SLOT(changeIcon()));
        }
    }
}

MyWindow::~MyWindow()
{
    delete myButtons;
}

最后，Main.cpp:

#include <QApplication>
#include "MyWindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
        MyWindow fenetre;
        fenetre.show();
        return app.exec();
}

以防万一，这里是Test.pro

SOURCES += 
    Main.cpp 
    MyWindow.cpp 
    hexbutton.cpp
HEADERS += 
    MyWindow.h 
    hexbutton.h

我得到了两个错误：

1） 找不到体系结构x86_64 的符号

2） collect2:ld返回1退出状态

它还说121次（11*11）：

对象：：connect：中没有这样的插槽QPushButton:：changeIcon（）/Test/MyWindow.cpp:19

在编译输出上显示：

18:22:15: Running build steps for project Test...
18:22:15: Configuration unchanged, skipping qmake step.
18:22:15: Starting: "/usr/bin/make" -w
make: Entering directory `/Users/jonathanbibas/Documents/Workspace Qt/Test-build-desktop-Desktop_Qt_4_8_0_for_GCC__Qt_SDK__Debug'
g++ -c -pipe -g -gdwarf-2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.5 -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB -I../../../QtSDK/Desktop/Qt/4.8.0/gcc/mkspecs/macx-g++ -I../Test -I../../../QtSDK/Desktop/Qt/4.8.0/gcc/lib/QtCore.framework/Versions/4/Headers -I../../../QtSDK/Desktop/Qt/4.8.0/gcc/include/QtCore -I../../../QtSDK/Desktop/Qt/4.8.0/gcc/lib/QtGui.framework/Versions/4/Headers -I../../../QtSDK/Desktop/Qt/4.8.0/gcc/include/QtGui -I../../../QtSDK/Desktop/Qt/4.8.0/gcc/include -I. -I../Test -I. -F/Users/jonathanbibas/QtSDK/Desktop/Qt/4.8.0/gcc/lib -o hexbutton.o ../Test/hexbutton.cpp
g++ -headerpad_max_install_names -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.5 -o Test.app/Contents/MacOS/Test Main.o MyWindow.o hexbutton.o moc_MyWindow.o   -F/Users/jonathanbibas/QtSDK/Desktop/Qt/4.8.0/gcc/lib -L/Users/jonathanbibas/QtSDK/Desktop/Qt/4.8.0/gcc/lib -framework QtGui -framework QtCore 
Undefined symbols for architecture x86_64:
  "vtable for HexButton", referenced from:
      HexButton::HexButton(QWidget*, QIcon&, int, int)in hexbutton.o
      HexButton::HexButton(QWidget*, QIcon&, int, int)in hexbutton.o
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [Test.app/Contents/MacOS/Test] Error 1
make: Leaving directory `/Users/jonathanbibas/Documents/Workspace Qt/Test-build-desktop-Desktop_Qt_4_8_0_for_GCC__Qt_SDK__Debug'
18:22:20: The process "/usr/bin/make" exited with code 2.
Error while building project Test (target: Desktop)
When executing build step 'Make'

显然，错误来自Q_OBJECT（插槽定义所需），但我的代码有问题，而不是我的编译器（因为当插槽在MainWindow中时，我有，它工作正常）。

谢谢你的帮助！