NVRAM Free Webspace: Compiling leJOS under 64-bit Linux/title>
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<H1 id="page_title">Building leJOS on 64-bit Linux</H1>
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<a class="menulinks" href="/index.html">Greetings</a>
<a class="menulinks" href="/reply-to.html">"Reply-To"</a>
<a class="menulinks" href="/lejos.html">Building leJOS under 64-bit Linux</a>
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<h2>Introduction</h2>
<div class="textarea">
<div>
This page attempts to show how to compile
<a target="_new"
href="http://lejos.sf.net/">leJOS</a> on 64-bit Linux machines. It is
a work in progress, so see the forums
<a target="_new"
href="http://lejos.sourceforge.net/forum"
>http://lejos.sourceforge.net/forum</a> for updates and discussion.
</div>
<div>
The initial problem is that, as of 0.4.0, the JNI sources and the ANT
build script are only targeted at 32-bit systems.
</div>
<div>
This is my attempt at a simple compilation for 64-bit Linux.
</div>
<ol style="list-style-type:upper-roman">
<li>Install the JDK somewhere on your machine and set an
environment variable <strong>JAVA_HOME</strong> to its base.
</li>
<li>Set an environment variable <strong>JAVA_HOME</strong> to its base.
</li>
<li>Make sure that you read through the <a class="extra"
href="http://lejos.sourceforge.net/forum/viewtopic.php?t=236"
>leJOS NXJ FAQ</a>.
</li>
<li>Look through the revised <a
href="http://www.variantpress.com/file_download/5">installation
instructions</a>, but note that:
<ul>
<li>You need a <strong>32-bit (386) version</strong> of libusb,
the base package and <strong>*-devel</strong> package.</li>
<li>If you get missing file errors for "bluetooth.h" then verify
that you have the base and <strong>*-devel</strong> Bluetooth
packages installed (possibly named <strong>bluez<strong> or
<strong>libbluetooth</strong>).</li>
</ul>
<ol>
<li>Download and decompress the tar file from www.lejos.org.</li>
<li>Add the environment variable NXJ_HOME and set it to the
directory you installed leJOS.</li>
<li>Add the leJOS bin directory to your PATH. Depending on
the privilege settings, you might need to adjust the execution
permissions in the bin folder.</li>
<li>Your PATH must also contain the ant binary (ant 1.6 or
above).</li>
<li>You need libusb installed so the leJOS tools can access your
USB port. This can be downloaded from: <a
href="http://libusb.sourceforge.net"
>http://libusb.sourceforge.net</a>
<br/><div class="note">Search for a package
for your OS distribution first, and make sure to get 32-bit (386)
versions and the <em>-devel</em> version, too.
</li>
<li class="extra">Create an executable shell script named <strong>gcc</strong> in
the <strong>build</strong> sub-directory of leJOS:
<pre class='code'>
cd $NXJ_HOME/build
echo '#!/bin/bash -x' > gcc
echo 'inc=${JAVA_HOME}/include' >> gcc
echo 'export C_INCLUDE_PATH=.:$inc:$inc/linux' >> gcc
echo 'export PATH=${JAVA_HOME}/bin:$PATH' >> gcc
echo 'exec /usr/bin/gcc -m32 "$@"' >> gcc
chmod +x ./gcc</pre>
<em>NOTE: Change the last line if needed:</em><ul>
<li>Add <strong>-v</strong> (before <strong>-m32</strong>) if
you are having problems and want to see what GCC is doing
in more detail,</li>
<li>Change the path to GCC if needed. To check, use:
<strong>type gcc</strong></li>
</ul>
</li>
<li class="extra">Prepend your <strong>PATH</strong> with the new shell script,
and build:
<pre class="code">
export PATH=$PWD:$PATH
ant build</pre>
</li>
<li>Now you need to build the distribution. Switch to the build
folder and run ant. Note that depending on the privilege settings
you might need to adjust the execution permissions in the release
folder.</li>
</li>
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