odify the memory-allocation routines in FFTW (they are defined
in <code>kernel/alloc.c</code>).
</p>
<a name="Fortran-interface"></a>
<h3 class="heading">Fortran interface</h3>

<p>In FFTW 2, the subroutine names were obtained by replacing &lsquo;<samp>fftw_</samp>&rsquo;
with &lsquo;<samp>fftw_f77</samp>&rsquo;; in FFTW 3, you replace &lsquo;<samp>fftw_</samp>&rsquo; with
&lsquo;<samp>dfftw_</samp>&rsquo; (or &lsquo;<samp>sfftw_</samp>&rsquo; or &lsquo;<samp>lfftw_</samp>&rsquo;, depending upon the
precisi