FFTW: Fastest Fourier Transform in the West

PSRCHIVE requires a single-precision version of the FFTW library to perform the Fast Fourier Transform. FFTW is freely available at fftw.org and licensed under the GNU GPL.

Download

FFTW version 3.1 is available at the FFTW download page.

Install

It is important to configure FFTW to build the single-precision version of the library using the --enable-float option to the configure script. For example, after downloading the archive, run: 
gunzip -c fftw-3.1.2.tar.gz | tar xvf -
cd fftw-3.1.2
./configure --enable-float
make
make install

Group Installation

For a group installation, set the installation directory with the --prefix option; e.g. 
./configure --enable-float --prefix=$PSRHOME/packages/$LOGIN_ARCH