beignet-opencl-icd software package provides OpenCL library for Intel GPUs, 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 beignet-opencl-icd
beignet-opencl-icd is installed in your system.
Make ensure the beignet-opencl-icd package were installed using the commands given below,
$ sudo dpkg-query -l | grep beignet-opencl-icd *
You will get with beignet-opencl-icd package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Libraries |
| Package | beignet-opencl-icd |
| Version | 1.2.0-3 |
| Description | OpenCL library for Intel GPUs |
| Sub Section | Libs |