de 'fftw3.f03'
  include 'fftw3l.f03'
</pre></div>

<p>We also support using the nonstandard <code>__float128</code>
quadruple-precision type provided by recent versions of <code>gcc</code> on
32- and 64-bit x86 hardware (see <a href="Installation-and-Customization.html">Installation and Customization</a>),
using the corresponding <code>real(16)</code> and <code>complex(16)</code> types
supported by <code>gfortran</code>.  The quadruple-precision &lsquo;<samp>fftwq_</samp>&rsquo;
functions (see <a href="Pre