Install hexchat-dev by entering the following commands in the terminal:
sudo apt update sudo apt install hexchat-dev
Description:
Development files for HexChat
This package contains the hexchat-plugin.h and hexchat-plugin.pc files, which facilitate building binary plugins. Hexchat is a popular and featureful IRC client with a GTK+ GUI. For more information on IRC, see http://irchelp.org/.
Homepage: https://hexchat.github.io
Version: 2.14.1-2
Section: universe/net