Install gir1.2-gdl-3 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-gdl-3
Description:
GObject introspection data for the GDL library
This package contains introspection data for the GNOME DevTool libraries, a support library for GNOME development tools. . It can be used by packages using the GIRepository format to generate dynamic bindings.
Version: 3.28.0-1
Section: universe/introspection