cl-interpol software package provides String interpolation for Common Lisp, 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 cl-interpol
cl-interpol is installed in your system.
Make ensure the cl-interpol package were installed using the commands given below,
$ sudo dpkg-query -l | grep cl-interpol *
You will get with cl-interpol package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Lisp |
| Package | cl-interpol |
| Version | 0.2.5-1 |
| Description | String interpolation for Common Lisp |
| Sub Section | Lisp |