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<title>Qt 4.6: Installing Qt on Embedded Linux</title>
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<td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td>
<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">Installing Qt on Embedded Linux<br /><span class="subtitle"></span>
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<p>This document describes how to install <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> in your development environment:</p>
<ul><li><a href="#step-1-installing-the-license-file-commercial-editions-only">Step 1: Installing the License File (commercial editions only)</a></li>
<li><a href="#step-2-unpacking-the-archive">Step 2: Unpacking the Archive</a></li>
<li><a href="#step-3-building-the-library">Step 3: Building the Library</a></li>
<li><a href="#step-4-adjusting-the-environment-variables">Step 4: Adjusting the Environment Variables</a></li>
<li><a href="#step-5-building-the-virtual-framebuffer">Step 5: Building the Virtual Framebuffer</a></li>
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<p>Please see the <a href="qt-embedded-crosscompiling.html">cross compiling</a> and <a href="qt-embedded-deployment.html">deployment</a> documentation for details on how to install <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> on your target device.</p>
<p>Note also that this installation procedure is written for Linux, and that it may need to be modified for other platforms.</p>
<a name="step-1-installing-the-license-file-commercial-editions-only"></a>
<h3>Step 1: Installing the License File (commercial editions only)</h3>
<p>If you have the commercial edition of <a href="qt-embedded-linux.html">Qt for Embedded Linux</a>, the first step is to install your license file as <tt>$HOME/.qt-license</tt>.</p>
<p>For the open source version you do not need a license file.</p>
<a name="step-2-unpacking-the-archive"></a>
<h3>Step 2: Unpacking the Archive</h3>
<p>First uncompress the archive in the preferred location, then unpack it:</p>
<pre> cd <anywhere>
gunzip qt-everywhere-opensource-src-4.6.3.tar.gz
tar xf qt-everywhere-opensource-src-4.6.3.tar</pre>
<p>This document assumes that the archive is unpacked in the following directory:</p>
<pre> ~/qt-everywhere-opensource-src-4.6.3</pre>
<a name="step-3-building-the-library"></a>
<h3>Step 3: Building the Library</h3>
<p>Before building the <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> library, run the <tt>./configure</tt> script to configure the library for your development architecture. You can list all of the configuration system's options by typing</p>
<pre> ./configure -embedded -help</pre>
<p>Note that by default, <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> is configured for installation in the <tt>/usr/local/Trolltech/QtEmbedded-4.6.3</tt> directory, but this can be changed by using the <tt>-prefix</tt> option. Alternatively, the <tt>-prefix-install</tt> option can be used to specify a "local" installation within the source directory.</p>
<p>The configuration system is also designed to allow you to specify your platform architecture:</p>
<pre> cd ~/qt-everywhere-opensource-src-4.6.3
./configure -embedded [architecture]</pre>
<p>In general, all Linux systems which have framebuffer support can use the <tt>generic</tt> architecture. Other typical architectures are <tt>x86</tt>, <tt>arm</tt> and <tt>mips</tt>.</p>
<p><b>Note:</b> If you want to build Qt for Embedded Linux for use with a virtual framebuffer, pass the <tt>-qvfb</tt> option to the <tt>configure</tt> script.</p>
<p>To create the library and compile all the demos, examples, tools, and tutorials, type:</p>
<pre> make</pre>
<p>On some systems the <tt>make</tt> utility is named differently, e.g. <tt>gmake</tt>. The <tt>configure</tt> script tells you which <tt>make</tt> utility to use.</p>
<p>If you did not configure <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> using the <tt>-prefix-install</tt> option, you need to install the library, demos, examples, tools, and tutorials in the appropriate place. To do this, type:</p>
<pre> su -c "make install"</pre>
<p>and enter the root password.</p>
<p><b>Note:</b> You can use the <tt>INSTALL_ROOT</tt> environment variable to specify the location of the installed files when invoking <tt>make install</tt>.</p>
<a name="step-4-adjusting-the-environment-variables"></a>
<h3>Step 4: Adjusting the Environment Variables</h3>
<p>In order to use <a href="qt-embedded-linux.html">Qt for Embedded Linux</a>, the <tt>PATH</tt> variable must be extended to locate <tt>qmake</tt>, <tt>moc</tt> and other <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> tools, and the <tt>LD_LIBRARY_PATH</tt> must be extended for compilers that do not support <tt>rpath</tt>.</p>
<p>To set the <tt>PATH</tt> variable, add the following lines to your <tt>.profile</tt> file if your shell is bash, ksh, zsh or sh:</p>
<pre> PATH=/usr/local/Trolltech/QtEmbedded-4.6.3/bin:$PATH
export PATH</pre>
<p>In case your shell is csh or tcsh, add the following line to the <tt>.login</tt> file instead:</p>
<pre> setenv PATH /usr/local/Trolltech/QtEmbedded-4.6.3/bin:$PATH</pre>
<p>If you use a different shell, please modify your environment variables accordingly.</p>
<p>For compilers that do not support <tt>rpath</tt> you must also extend the <tt>LD_LIBRARY_PATH</tt> environment variable to include <tt>/usr/local/Trolltech/QtEmbedded-4.6.3/lib</tt>. Note that on Linux with GCC, this step is not needed.</p>
<a name="step-5-building-the-virtual-framebuffer"></a>
<h3>Step 5: Building the Virtual Framebuffer</h3>
<p>For development and debugging, <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> provides a virtual framebuffer as well as the option of running <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> as a VNC server. For a description of how to install the virtual framebuffer and how to use the VNC protocol, please consult the documentation at:</p>
<ul>
<li><a href="qvfb.html">The Virtual Framebuffer</a></li>
<li><a href="qt-embedded-vnc.html">The VNC Protocol and Qt for Embedded Linux</a></li>
</ul>
<p>Note that the virtual framebuffer requires a Qt for X11 installation. See <a href="install-x11.html">Installing Qt on X11 Platforms</a> for details.</p>
<p>The Linux framebuffer, on the other hand, is enabled by default on all modern Linux distributions. For information on older versions, see <a href="http://en.tldp.org/HOWTO/Framebuffer-HOWTO.html">http://en.tldp.org/HOWTO/Framebuffer-HOWTO.html</a>. To test that the Linux framebuffer is set up correctly, use the program provided by the <a href="qt-embedded-testingframebuffer.html">Testing the Linux Framebuffer</a> document.</p>
<p>That's all. <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> is now installed.</p>
<p><table class="generic" width="100%" align="center" cellpadding="2" cellspacing="1" border="0">
<tr valign="top" class="odd"><td><b>Customizing the Qt for Embedded Linux Library</b><p>When building embedded applications on low-powered devices, reducing the memory and CPU requirements is important.</p>
<p>A number of options tuning the library's performance are available. But the most direct way of saving resources is to fine-tune the set of Qt features that is compiled. It is also possible to make use of accelerated graphics hardware.</p>
<ul>
<li><a href="fine-tuning-features.html">Fine-Tuning Features in Qt</a></li>
<li><a href="qt-performance.html">Qt Performance Tuning</a></li>
<li><a href="qt-embedded-accel.html">Adding an Accelerated Graphics Driver to Qt for Embedded Linux</a></li>
</ul>
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