ale software package provides synthetic capture engine and renderer, 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 ale
ale is installed in your system.
Make ensure the ale package were installed using the commands given below,
$ sudo dpkg-query -l | grep ale *
You will get with ale package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Graphics |
| Package | ale |
| Version | 0.9.0.3-2+b3 [amd64], 0.9.0.3- |
| Description | synthetic capture engine and renderer |
| Sub Section | Graphics |