[patch] Use fftw if available

[John W. Eaton]

On 21-Apr-2001, Mumit Khan <address@hidden> wrote:

| [ I'm not subscribed to the list, so please copy me if appropriate ]
| 
| The attached patch is a first cut at enabling fftw support in Octave. I
| did some quick tests, and even while the fftw interface here is suboptimal
| at best, there is still significant performance boost.

I applied your patches and made the default configure action to check
for and use the fftw library even if --with-fftw is not specified.

Thanks!

jwe