gnash-opengl software package provides dummy package for gnash-opengl removal, 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 gnash-opengl
gnash-opengl is installed in your system.
Make ensure the gnash-opengl package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnash-opengl *
You will get with gnash-opengl package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Old Libraries |
| Package | gnash-opengl |
| Version | 0.8.11~git20160608-1.1 |
| Description | dummy package for gnash-opengl removal |
| Sub Section | Oldlibs |