hexchat-common software package provides Common files for HexChat, 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 hexchat-common
hexchat-common is installed in your system.
Make ensure the hexchat-common package were installed using the commands given below,
$ sudo dpkg-query -l | grep hexchat-common *
You will get with hexchat-common package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | hexchat-common |
| Version | 2.12.0-2 |
| Description | Common files for HexChat |
| Sub Section | Net |