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<h1 class="title">Porting Guide</h1>
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<p>Qt 5 is a result of the conscious effort to make this C++ framework more efficient and easy to use. This release replaces quite a few legacy APIs with more meaningful ones, such as the newer version of Qt Quick.</p>
<p>We try to maintain binary and source compatibility for all the public APIs in each release, but some changes were inevitable in an effort to make Qt a better framework. In this topic, we try to summarize those changes and provide guidance to handle them.</p>
<p>The following list summarizes the changes in Qt 5:</p>
<ul>
<li>Modularized codebase - This means only Qt essentials and the add-on modules you're interested in are needed to develop an application. To know what makes the essentials and add-on modules, refer to the <a href="qtmodules.html">modules</a> page.</li>
<li>Platform-specific code - Symbian and Meego-specific code is removed from the codebase.</li>
<li>Platform defines - All platform-specific code must be wrapped using the preprocessor macro, <tt>Q_OS_*</tt> instead of <tt>Q_WS_*</tt>.</li>
<li>Widgets - These are now part of a separate module, <a href="../qtwidgets/qtwidgets-index.html">Qt Widgets</a>. They were part of <a href="../qtgui/qtgui-index.html">Qt GUI</a> earlier.</li>
<li>Qt Quick - The older Qt Quick version (1.0) is now part of a separate <a href="http://qt-project.org/doc/qt-4.8/qtdeclarative.html">Qt Declarative</a> add-on module for compatibility purposes. We recommend using the new Qt Quick (2.0) from now on to avoid binary breaks in the future.</li>
<li>Qt3Support - This module is removed in Qt 5, so you must move away from this module before porting your codebase to Qt 5.</li>
<li>Qt <a href="../qtwebkit/webkit.html">WebKit</a> - This module has been split into two, there is now a <a href="../qtwebkit/qtwebkit-index.html">Qt WebKit</a> and a <a href="../qtwebkit/qtwebkitwidgets-index.html">Qt WebKit Widgets</a> module.</li>
<li>Multimedia - In Qt 5, multimedia support is provided by the <a href="../qtmultimedia/qtmultimedia-index.html">Qt Multimedia</a> module. Phonon framework is no longer part of Qt, but it continues to be maintained by the Phonon developers and has support for Qt 5. See <a href="http://phonon.kde.org">http://phonon.kde.org</a>.</li>
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<li><a href="sourcebreaks.html">C++ API Changes</a></li>
<li><a href="portingcppapp.html">Porting C++ Applications to Qt 5</a></li>
<li><a href="qtquick-porting-qt5.html">Porting QML Applications to Qt 5</a></li>
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