Installing FFTW

FFTW is a library for calculating Discrete Fourier Transform (FFT) in one or more dimensions, whether these are complex, real, symmetric. It is one of the fastest public libraries that exist in its genre. The steps described here have been applied on a white Macbook with 4GB of RAM and OSX 10.6. 

1. Download version 3.3.2 of FFTW from here. Unzip the package and put the folder fftw-3.3.2 in /usr/local. Next in a terminal: cd /usr/local/fftw-3.3.2
2. Set the enable shared option to configure: ./configure --enable-shared
3. Finally type make and then sudo make install