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I already have fftw-2.1.5 on my system. How can I change it from double precision to single precision and do I need to reinstall it? Any help would be much appreciated.

Soheil
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    That's a *very* old version, but if you still have the source then you need to do another `./configure` for single precision, then the usual `make install`. – Paul R Jun 30 '16 at 06:09
  • Thanks Paul. I did it with ./configure --enable-single-prefix and it gives me another error: _italic_ **bold** 'checking how to get verbose linking output from /usr/local/scisoft//packages/iraf/iraf/unix/hlib//f77.sh... configure: WARNING: compilation failed checking for Fortran 77 libraries... -L/usr/local/scisoft/lib/' -L/usr/local/scisoft/lib/ checking for dummy main to link with Fortran 77 libraries... none checking for Fortran 77 name-mangling scheme... configure: error: cannot compile a simple Fortran program See `config.log' for more details.' Any idea how to fix it? – Soheil Jun 30 '16 at 11:28
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    It should be `--enable-float`, not `--enable-single=prefix`. Try that, and if you still have problems then I would try the current version (FFTW3) rather than the ancient FFTW2. – Paul R Jun 30 '16 at 18:27

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