fftw3 package

Hello,

I just stumbled over this, while packaging dangerdeep, which might break in a 
reference build. The reason for this is the fftw3 package. We currently set 
the --enable-float switch in the conf file, this creates a fftw3f lib instead 
of the normal fftw3 lib. This would be the problem if one could just link 
against fftw3f. I tried but I got unresolved symbols. I "fixed" that by 
removing that switch while building fftw3 on my system. I consider this a bug 
of the fftw3 package that it does not produce its normal lib when the switch 
is activated. The reaso why I did not send a patch for the package is, that I 
don't know if other packages rely on the fftw3f lib. Perhaps Chris can say 
sth about that, and perhaps reporting the bug to the developers ( I can do 
that as well, if you like).

Cheers,

Daniel