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
download file now