libfftw3-quad3 software package provides Library for computing Fast Fourier Transforms - Quad precision, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libfftw3-quad3
libfftw3-quad3 is installed in your system.
Make ensure the libfftw3-quad3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libfftw3-quad3 *
You will get with libfftw3-quad3 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Libraries |
| Package | libfftw3-quad3 |
| Version | 3.3.3-7ubuntu3 |
| Description | Library for computing Fast Fourier Transforms - Quad precision |
| Sub Section | libs |