 have to link to
a separate library (<code>-lfftw3_threads -lfftw3 -lm</code> on Unix), as well as
to the threading library (e.g. POSIX threads on Unix).
</p>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>

<h3><a name="FOOT11" href="#DOCF11">(11)</a></h3>
<p>We
do our own buffering because GNU libc I/O routines are horribly slow for
single-character I/O, apparently for thread-safety reasons (whether you
are using threads or not).</p>
</div>
<hr>
<div class="header">
<p>
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