assimp-utils software package provides 3D model import library (utilities), 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 assimp-utils
assimp-utils is installed in your system.
Make ensure the assimp-utils package were installed using the commands given below,
$ sudo dpkg-query -l | grep assimp-utils *
You will get with assimp-utils package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | assimp-utils |
| Version | 3.3.1~dfsg-4 |
| Description | 3D model import library (utilities) |
| Sub Section | Utils |