FFTW: install both the single- and double-precision libraries on the same machine

1. Download FFTW package from http://www.fftw.org/

2. So, to install both the single- and double-precision libraries on the

same machine, you would do:

./configure --enable-type-prefix [ other options ]

make

sudo make install

sudo make clean

./configure --enable-float --enable-type-prefix [ other options ]

make

sudo make install

Ref:http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=fw&db=info&fname=/usr/freeware/info_tpl/fftw/fftw_71.html