cmuscheme48-el software package provides Emacs mode specialized for Scheme48, 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 cmuscheme48-el
cmuscheme48-el is installed in your system.
Make ensure the cmuscheme48-el package were installed using the commands given below,
$ sudo dpkg-query -l | grep cmuscheme48-el *
You will get with cmuscheme48-el package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Lisp |
| Package | cmuscheme48-el |
| Version | 1.9-5 |
| Description | Emacs mode specialized for Scheme48 |
| Sub Section | Lisp |