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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>
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<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.
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