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<h3 class="section">4.1 Data Types and Files</h3>
<p>All programs using FFTW should include its header file:
<pre class="example"> #include <fftw3.h>
</pre>
<p>You must also link to the FFTW library. On Unix, this
means adding <code>-lfftw3 -lm</code> at the <em>end</em> of the link command.
<ul class="menu">
<li><a accesskey="1" href="Complex-numbers.html#Complex-numbers">Complex numbers</a>
<li><a accesskey="2" href="Precision.html#Precision">Precision</a>
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