clblas-client software package provides client program for clBLAS, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install clblas-client
clblas-client is installed in your system.
Make ensure the clblas-client package were installed using the commands given below,
$ sudo dpkg-query -l | grep clblas-client *
You will get with clblas-client package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | clblas-client |
| Version | 2.10-4 |
| Description | client program for clBLAS |
| Sub Section | Utils |