<a href="https://github.com/gwf/CBofN" rel="nofollow">https://github.com/gwf/CBofN</a><p>Get "The Computational Beauty of Nature.
Computer Explorations of Fractals, Chaos, Complex Systems, and Adaptation" too.<p>In order to compile it under Debian/Ubuntu:<p><pre><code> sudo apt-get install git build-essential xorg-dev
git clone https://github.com/gwf/CBofN
cd CBofN
make
</code></pre>
OpenBSD: get git and gmake, you already know what to do then.
If it fails, edit the makefile so it matches the correct x11 libraries and headers: /usr/X11R6/include and /usr/X11R6/lib.