i8c software package provides infinity note compiler, 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 i8c
i8c is installed in your system.
Make ensure the i8c package were installed using the commands given below,
$ sudo dpkg-query -l | grep i8c *
You will get with i8c package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | i8c |
| Version | 0.0.4-1 |
| Description | infinity note compiler |
| Sub Section | devel |