gpp software package provides A general-purpose preprocessor with customizable syntax, 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 gpp
gpp is installed in your system.
Make ensure the gpp package were installed using the commands given below,
$ sudo dpkg-query -l | grep gpp *
You will get with gpp package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | gpp |
| Version | 2.24-3+b1 [armhf], 2.24-3 [amd |
| Description | A general-purpose preprocessor with customizable syntax |
| Sub Section | devel |