用“qt-opensource-linux-x64-5.3.0.run”版本，安裝步驟，該版本已經集成了QtCreator，在Tools目錄下：

[email protected]:/opt/Qt5.3.0$ ls
5.3  components.xml  Docs  Examples  InstallationLog.txt  Licenses  MaintenanceTool  MaintenanceTool.dat  MaintenanceTool.ini  network.xml  qt-project.org.html  README.txt  Tools

QtCreator:

[email protected]:/opt/Qt5.3.0$ cd Tools/
[email protected]:/opt/Qt5.3.0/Tools$ ls
QtCreator
[email protected]:/opt/Qt5.3.0/Tools$ cd QtCreator/
[email protected]:/opt/Qt5.3.0/Tools/QtCreator$ ls
bin  lib  share
[email protected]:/opt/Qt5.3.0/Tools/QtCreator$ cd bin/
[email protected]:/opt/Qt5.3.0/Tools/QtCreator/bin$ ls
imports  plugins  qml  qml2puppet  qmlpuppet  qt.conf  qtcreator  qtcreator_process_stub  qtcreator.sh  qtpromaker  sdktool
 

[email protected]:/opt/Qt5.3.0$ cd 5.3/
[email protected]:/opt/Qt5.3.0/5.3$ ls
gcc_64
[email protected]:/opt/Qt5.3.0/5.3$ cd gcc_64/
[email protected]:/opt/Qt5.3.0/5.3/gcc_64$ ls
bin  imports  include  lib  libexec  mkspecs  phrasebooks  plugins  qml  translations
[email protected]:/opt/Qt5.3.0/5.3/gcc_64$ cd bin/
 
[email protected]:/opt/Qt5.3.0/5.3/gcc_64/bin$ ls
assistant  linguist  moc                   qdbus         qdbusxml2cpp    qhelpgenerator  qml             qmlbundle         qmlplugindump  qmltestrunner  qtdiag   syncqt.pl    xmlpatternsvalidator
designer   lrelease  pixeltool             qdbuscpp2xml  qdoc            qlalr           qml1plugindump  qmlimportscanner  qmlprofiler    qmlviewer      qtpaths  uic
lconvert   lupdate   qcollectiongenerator  qdbusviewer   qhelpconverter  qmake           qml2puppet      qmlmin            qmlscene       qt.conf        rcc      xmlpatterns

開啟Qt creator:

1. “File” - “New File or Project”- “Other Project” - “Empty Qt Project”:

“Choose...”，出來的新視窗中輸入專案名稱HelloWorld，和你想將其建立在的目錄。

2. 點“Next”選擇KitSelection，設定“QtVersions” (Qt SDK的qmake所在路徑),“Compilers”等，如下：

說明：這些也可以之前就在Qtcreator的“Tools” - “Options” - “Build &Run”裡面逐一設定好這裡就可以直接選用了。

3. 設定完“Ok”,進入：

“Next”，然後“Finish”。

4. 在新建立的專案名稱上右擊，“addNew...” - “C++” - “C++ Source File”, “Choose...”,在彈出的新視窗輸入原始檔名稱SayHello，如下：

“Next” -“Finish”。在SayHello.cpp中輸入如下程式碼：

#include <QtWidgets/QApplication>
#include <QtWidgets/QtWidgets>
#include <QtGui/QPalette>
#include <QtWidgets/QLabel>

int main(int argc, char *argv[])
{
    QApplication app(argc,argv);
    QWidget *widget=new QWidget();

    widget->setAutoFillBackground(true);

    widget->resize(300,200);

    //設定QPalette物件的背景屬性（顏色或圖片）
    QPalette palette;
    palette.setColor(QPalette::Background, QColor(192,253,123));
    //palette.setBrush(QPalette::Background, QBrush(QPixmap(":/background.png")));
    widget->setPalette(palette);

    // 在widget裡面輸出一句話
    QLabel *label = new QLabel("Hello World!", widget);
    label->setText("The first Qt5 program!");

    widget->show();

    return app.exec();
}

5. 在Qtcreator裡面編譯，執行。（“Build”- “Run”），報錯：

~/HelloWorld/SayHello.cpp:14:error: undefined reference to `QApplication::QApplication(int&,char**, int)'
~/HelloWorld/SayHello.cpp:15:error: undefined reference to `QWidget::QWidget(QWidget*,QFlags<Qt::WindowType>)'
~/HelloWorld/SayHello.cpp:17:error: undefined reference to `QWidget::setAutoFillBackground(bool)'

6. 開啟HelloWorld.pro，新增如下一行（新增widgets元件）：

QT+= widgets

7. 再次“Build”- “Run”，成功。輸出如下：