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  <div class="section" id="pyqt4-and-qt-v5">
<h1>PyQt4 and Qt v5<a class="headerlink" href="#pyqt4-and-qt-v5" title="Permalink to this headline">¶</a></h1>
<div class="section" id="building-against-qt-v5">
<h2>Building Against Qt v5<a class="headerlink" href="#building-against-qt-v5" title="Permalink to this headline">¶</a></h2>
<p>PyQt4 can be built against Qt v5 in exactly the same way that it is built
against Qt v4.  However only a Qt v4 compatible subset of Qt v5 is supported,
specifically:</p>
<ul class="simple">
<li>any classes added in Qt v5 <em>are not</em> supported</li>
<li>any new features added in Qt v5 to classes that exist in Qt v4 <em>are</em>
supported</li>
<li>any features that are marked as deprecated in Qt v5 <em>are</em> supported.</li>
</ul>
<p>Qt v5 handles connections to signals with optional arguments in a slightly
different way than Qt v4.  PyQt4 works around this as best it can but cannot do
so in the case where signals that have optional arguments in Qt v5 (but not in
Qt v4) are emitted using old-style signals (i.e. using <tt class="xref py py-meth docutils literal"><span class="pre">QObject.emit()</span></tt>).
Instead you should use new-style signals (i.e. use the <a class="reference internal" href="new_style_signals_slots.html#emit" title="emit"><tt class="xref py py-meth docutils literal"><span class="pre">emit()</span></tt></a> method of
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<p>The <a class="reference internal" href="installation.html#cmdoption-configure.py--no-deprecated"><em class="xref std std-option">--no-deprecated</em></a> option to PyQt4&#8217;s
<strong class="program">configure.py</strong> can be used to disable the support for the deprecated
features.  This can be useful in the porting of PyQt4 applications to PyQt5.</p>
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