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<h1 class="title">Using qt.conf</h1>
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<p>The <tt>qt.conf</tt> file overrides the hard-coded paths that are compiled into the Qt library. These paths are accessible using the <a href="../qtcore/qlibraryinfo.html">QLibraryInfo</a> class. Without <tt>qt.conf</tt>, the functions in <a href="../qtcore/qlibraryinfo.html">QLibraryInfo</a> return these hard-coded paths; otherwise they return the paths as specified in <tt>qt.conf</tt>.</p>
<p>Without <tt>qt.conf</tt>, the Qt libraries will use the hard-coded paths to look for plugins, translations, and so on. These paths may not exist on the target system, or they may not be accesssible. Because of this, you need <tt>qt.conf</tt> to make the Qt libraries look elsewhere.</p>
<p><a href="../qtcore/qlibraryinfo.html">QLibraryInfo</a> will load <tt>qt.conf</tt> from one of the following locations:</p>
<ol class="1">
<li><tt>:/qt/etc/qt.conf</tt> using the resource system</li>
<li>on Mac OS X, in the Resource directory inside the appliction bundle, for example <tt>assistant.app/Contents/Resources/qt.conf</tt></li>
<li>in the directory containing the application executable, i.e&#x2e; <a href="../qtcore/qcoreapplication.html#applicationDirPath">QCoreApplication::applicationDirPath</a>() + <a href="../qtcore/qdir.html#separator">QDir::separator</a>() + &quot;qt.conf&quot;</li>
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<p>The <tt>qt.conf</tt> file is an INI text file, as described in the <a href="../qtcore/qsettings.html#Format-enum">QSettings</a> documentation. The file should have a <tt>Paths</tt> group which contains the entries that correspond to each value of the <a href="../qtcore/qlibraryinfo.html#LibraryLocation-enum">QLibraryInfo::LibraryLocation</a> enum. See the <a href="../qtcore/qlibraryinfo.html">QLibraryInfo</a> documentation for details on the meaning of the various locations.</p>
<table class="generic">
 <thead><tr class="qt-style"><th >Entry</th><th >Default Value</th></tr></thead>
<tr valign="top" class="odd"><td >Prefix</td><td ><a href="../qtcore/qcoreapplication.html#applicationDirPath">QCoreApplication::applicationDirPath</a>()</td></tr>
<tr valign="top" class="even"><td >Documentation</td><td ><tt>doc</tt></td></tr>
<tr valign="top" class="odd"><td >Headers</td><td ><tt>include</tt></td></tr>
<tr valign="top" class="even"><td >Libraries</td><td ><tt>lib</tt></td></tr>
<tr valign="top" class="odd"><td >Binaries</td><td ><tt>bin</tt></td></tr>
<tr valign="top" class="even"><td >Plugins</td><td ><tt>plugins</tt></td></tr>
<tr valign="top" class="odd"><td >Imports</td><td ><tt>imports</tt></td></tr>
<tr valign="top" class="even"><td >Data</td><td ><tt>.</tt></td></tr>
<tr valign="top" class="odd"><td >Translations</td><td ><tt>translations</tt></td></tr>
<tr valign="top" class="even"><td >Settings</td><td ><tt>.</tt></td></tr>
<tr valign="top" class="odd"><td >Examples</td><td ><tt>.</tt></td></tr>
<tr valign="top" class="even"><td >Demos</td><td ><tt>.</tt></td></tr>
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<p>Absolute paths are used as specified in the <tt>qt.conf</tt> file. All paths are relative to the <tt>Prefix</tt>. On Windows and X11, the <tt>Prefix</tt> is relative to the directory containing the application executable (<a href="../qtcore/qcoreapplication.html#applicationDirPath">QCoreApplication::applicationDirPath</a>()). On Mac OS X, the <tt>Prefix</tt> is relative to the <tt>Contents</tt> in the application bundle. For example, <tt>application.app/Contents/plugins/</tt> is the default location for loading Qt plugins. Note that the plugins need to be placed in specific sub-directories under the <tt>plugins</tt> directory (see <a href="../qtcore/plugins-howto.html">How to Create Qt Plugins</a> for details).</p>
<p>For example, a <tt>qt.conf</tt> file could contain the following:</p>
<pre class="cpp"><span class="operator">[</span>Paths<span class="operator">]</span>
Prefix <span class="operator">=</span> <span class="operator">/</span>some<span class="operator">/</span>path
Translations <span class="operator">=</span> i18n</pre>
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