gfan software package provides program for computing with Groebner fans, 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 gfan
gfan is installed in your system.
Make ensure the gfan package were installed using the commands given below,
$ sudo dpkg-query -l | grep gfan *
You will get with gfan package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | gfan |
| Version | 0.5+dfsg-6 |
| Description | program for computing with Groebner fans |
| Sub Section | Math |