libclfft2 software package provides OpenCL FFT library (shared library), you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libclfft2
libclfft2 is installed in your system.
Make ensure the libclfft2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libclfft2 *
You will get with libclfft2 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | libclfft2 |
| Version | 2.10.2-1 |
| Description | OpenCL FFT library (shared library) |
| Sub Section | Libs |