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:-1: error: symbol(s) not found for architecture x86_64

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Hey n00b question. I know there have been several posts about this, but none of the suggestions I find help. Whenever I declare a slot in my .h file and define it in my .cpp file, it says that the ‘symbols not found for x86_64’. However when I comment out the slot declaration and definition, my program compiles fine. I really want to have these slots, so how can I declare/define them and have them work? here is my code: browser_v1.pro: QT       += core gui   greaterThan(QT_MAJOR_VERSION, 4): QT += webkitwidgets   TARGET = browser_v1 TEMPLATE = app     SOURCES += main.cpp\         mainwindow.cpp   HEADERS  += mainwindow.h   FORMS    +=   CONFIG += x86_64 mainwindow.h: #ifndef MAINWINDOW_H #define MAINWINDOW_H   #include <QMainWindow> #include <QWebView> #include <QLineEdit> #include <QToolBar> #include <QGridLayout>   namespace Ui { class MainWindow; }   class MainWindow : public QMainWindow {     Q_OBJECT   public:     MainWindow(const QUrl& url);     void changeURLbarText();   private slots:     void changeURLbarText();     void makeSearchURL();     void makeSearch();   private:     Ui::MainWindow *ui;       QWebView *webview;     QLineEdit *URLbar;     QLineEdit *SearchBar;     QToolBar *NavBar;     QGridLayout *mainLayout; };   #endif // MAINWINDOW_H mainwindow.cpp: #include "mainwindow.h"           MainWindow::MainWindow(const QUrl& Url) {       webview = new QWebView(this);     webview->load(Url);     connect(webview, SIGNAL(loadFinished(bool)), SLOT(changeURLbarText()));       URLbar = new QLineEdit(this);     connect(URLbar, SIGNAL(returnPressed()), SLOT(makeSearchURL()));       SearchBar = new QLineEdit(this);     connect(SearchBar, SIGNAL(returnPressed()), SLOT(makeSearch()));       QToolBar *NavBar = addToolBar(tr("Navigation"));     NavBar->addAction(webview->pageAction(QWebPage::Back));     NavBar->addAction(webview->pageAction(QWebPage::Forward));     NavBar->addAction(webview->pageAction(QWebPage::Reload));     NavBar->addAction(webview->pageAction(QWebPage::Stop));     NavBar->addWidget(URLbar);     NavBar->addWidget(SearchBar);         setCentralWidget(webview);     setUnifiedTitleAndToolBarOnMac(true);   }       void MainWindow::changeURLbarText() {     URLbar->setText(webview->Url().toString()); } main.cpp: #include "mainwindow.h" #include <QApplication>   int main(int argc, char *argv[]) {     QApplication a(argc, argv);     QUrl Url;     Url = QUrl("http://www.google.com/ncr");     //MainWindow w;     //w.show();     MainWindow *browser = new MainWindow(Url);     browser->show();       return a.exec(); } if it matters, I am using a Macbook Pro OS X 10.9 (64 bit), Qt 5.2 thanks in advanced for your help!

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