a/">Alexandria</a>, <a
href="http://common-lisp.net/project/babel/">Babel</a>, and <a
href="http://www.cliki.net/trivial-features">trivial-features</a>.

<p>The easiest way to download and install CL-PNG and the Lisp
libraries that it depends on is
using <a href="http://www.quicklisp.org/">QuickLisp</a>:
<pre>
    (ql:quickload "png")
</pre>

<p>If you do not want to use QuickLisp, install the dependencies, then
symlink <tt>png.asd</tt> (and, if you'd like to run the unit
tests, <tt>png-test.asd</tt>) to on