gir1.2-caja software package provides GObject introspection data for Caja, 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 gir1.2-caja
gir1.2-caja is installed in your system.
Make ensure the gir1.2-caja package were installed using the commands given below,
$ sudo dpkg-query -l | grep gir1.2-caja *
You will get with gir1.2-caja package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | gir1.2-caja |
| Version | 1.16.1-1 |
| Description | GObject introspection data for Caja |
| Sub Section | Utils |