Install gir1.2-devhelp-3.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-devhelp-3.0
Description:
GObject introspection data for the devhelp library
This library provides embedable widgets from the Devhelp program to be integrated in tools like the Anjuta IDE for browsing API reference documentation. . This package contains introspection data for the devhelp library. . It can be used by packages using the GIRepository format to generate dynamic bindings.
Homepage: https://wiki.gnome.org/Apps/Devhelp
Version: 3.28.1-1
Section: introspection