gir1.2-gmime-2.6 software package provides MIME message parser and creator library - GObject introspection data, 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-gmime-2.6
gir1.2-gmime-2.6 is installed in your system.
Make ensure the gir1.2-gmime-2.6 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gir1.2-gmime-2.6 *
You will get with gir1.2-gmime-2.6 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Introspection |
| Package | gir1.2-gmime-2.6 |
| Version | 2.6.20-8 |
| Description | MIME message parser and creator library - GObject introspection data |
| Sub Section | Introspection |