adacgi3 software package provides Ada CGI interface, 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 adacgi3
adacgi3 is installed in your system.
Make ensure the adacgi3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep adacgi3 *
You will get with adacgi3 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Web Software |
| Package | adacgi3 |
| Version | 1.6-19.1 |
| Description | Ada CGI interface |
| Sub Section | Web |