e
contains an example file <code>doc/f77_wisdom.f</code> demonstrating how to
implement <code>import_wisdom_from_file</code> and
<code>export_wisdom_to_file</code> subroutines in this way.  (These routines
cannot be compiled into the FFTW library itself, lest all FFTW-using
programs be required to link with the Fortran I/O library.)

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