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<h1 class="title">Platform Notes - X11<br /><span class="subtitle"></span>

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<p>Qt has been tested on AIX 5.2, using the <a href="compiler-notes.html#ibm-xlc-aix">xlC</a> compiler.</p>

<thead><tr valign="top" class="qt-style"><th>Compiler</th><th>Notes</th></tr></thead>

<tr valign="top" class="odd"><td>xlC</td><td>If Qt is built correctly but all symbols are reported to be missing when you link an application, your makeC++SharedLib script might be out of date. Make sure you have the latest version from the <a href="http://www-306.ibm.com/software/awdtools/vacpp/support/">IBM website</a>.</td></tr>

<tr valign="top" class="even"><td>GCC</td><td>We have tested earlier versions of Qt 4 successfully with GCC version 3.3 and above. Some versions of GCC may fail to link Qt with a "TOC overflow" message. Fix this by upgrading to the latest maintenance release of the dynamic linker. On AIX this is bos.rte.bind_cmds.4.1.5.3 or later. Some versions of GCC may fail to build Qt with STL and large-file support enabled, due to <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9551">a bug in GCC</a>. Fix this by upgrading to the latest maintenance release of the compiler. It is also possible to work around this problem by running configure with either <tt>-no-stl</tt> or <tt>-no-largefile</tt>.</td></tr>

<p>Qt's <a href="qtopengl.html">OpenGL</a> module requires GLX 1.3 or later to be installed. This is available for HP-UX 11i - see the <a href="http://docs.hp.com/en/5992-2331/ch04s02.html">Graphics and Technical Computing Software</a> section of the release notes for more information.</p>

<p><b>IRIX is an unsupported platform - please see Qt's online <a href="http://www.qtsoftware.com/support-services/support/platform-support-policy">Platform Support Policy</a> for details.</b></p>

<p><b>IRIX is an unsupported platform - please see Qt's online <a href="http://qt.nokia.com/doc/supported-platforms.html">Platform Support Policy</a> for details.</b></p>

<p>Unpackaging and IRIX tar: Because of long filenames some files will be cut off incorrectly with IRIX tar. Please use GNU tar to unpack Qt packages.</p>

<h2>Linux</h2>

<p>For the gcc/g++ compiler, please also see the relevant <a href="compiler-notes.html#gcc">compiler page</a>.</p>

<h3>Installation problems</h3>

<p>See also the <a href="http://www.qtsoftware.com/developer/faqs/qt/installation">Installation FAQ</a>.</p>

<p>See also the <a href="http://qt.nokia.com/developer/faqs/qt/installation">Installation FAQ</a>.</p>

<p>If you experience problems when installing new open source versions of Qt versions, try to use the open source Qt archives (e.g., RPM) provided by your Linux distribution. If you need to install the source (.tgz) archive, be aware that you will probably end up with two different versions of the Qt library installed on your system, which will probably lead to link errors, like this:</p>

<pre> undefined reference to `_vt.11QPushButton'</pre>

<p>Fix this by removing the old version of the library.</p>

<p>Be sure to check the installation notes for <a href="#gcc-on-solaris">GCC on Solaris</a>. Do not use GCC with Sun's assembler/linker, this will result in link-time errors in shared libraries. Use GNU binutils instead.</p>

<p>GCC 3.2.* is known to miscompile Qt due to an optimizer bug that will cause the resulting binaries to hang. Please use GCC 3.4.2 or later.</p>

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