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<title>Crystal Space 1.2.1: 2.4.5.1 Library Prerequisites</title>
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<h4 class="subsubsection"> 2.4.5.1 Library Prerequisites </h4>
<p>In addition to obtaining the project source code (see section <a href="Where-to-Get.html#0">Where to Get Crystal Space</a>), you
may also want to download and compile several support libraries used for image
manipulation (see section <a href="External-Libraries.html#0">External Libraries</a>). The libraries <samp>‘libpng’</samp> and
<samp>‘libjpeg’</samp>, which are present on many Unix installations, are absent from
MacOS/X. The optional <samp>‘libmng’</samp> is less common.
</p>
<p>One way to procure these libraries is to install them with Fink, which is a
tool for installing pre-built Unix and Unix-like tools and resources on
MacOS/X.
</p>
<p><a href="http://fink.sourceforge.net/">http://fink.sourceforge.net/</a>
</p>
<p>Alternately, the libraries can be built manually. You can download the
required external library source code packages from their canonical download
sites (see section <a href="External-Libraries.html#0">External Libraries</a>).
</p>
<p>If you have permission to do so, it is best to install the <small>JPEG</small>, <small>PNG</small>,
and <small>MNG</small> libraries in standard locations by following the installation
instructions for each package (for example <samp>‘make install’</samp>). In some
cases, these libraries may already be present on your computer if you installed
them separately (via Fink, for instance) or if they were installed by default.
(For example, <small>ZLIB</small>, which is also required by Crystal Space, is already
pre-installed on MacOS/X.)
</p>
<p>If you do not have permission to install these libraries, you can still build
Crystal Space by unpacking each external library into the <tt>‘CS/libs’</tt>
directory and building them there. For example:
</p>
<table><tr><td> </td><td><pre class="example">cd CS/libs
gnutar xfz libpng*.tar.gz
gnutar xfz jpegsrc*.tar.gz
gnutar xfz libmng*.tar.gz
</pre></td></tr></table>
<p>The libraries can be built as follows:
</p>
<table><tr><td> </td><td><pre class="example">cd CS/libs/libpng*
make -f scripts/makefile.macosx libpng.a
cd ../*jpeg*
sh ./configure
make libjpeg.a
cd ../libmng*
sh ./configure
make libmng.a
</pre></td></tr></table>
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