Install valac-0.40-vapi by entering the following commands in the terminal:
sudo apt update sudo apt install valac-0.40-vapi
Description:
C# like language for the GObject system - vapi files
Vala is a new programming language that aims to bring modern programming language features to GNOME developers without imposing any additional runtime requirements and without using a different ABI compared to applications and libraries written in C. . valac, the Vala compiler, is a self-hosting compiler that translates Vala source code into C source and header files. It uses the GObject type system to create classes and interfaces declared in the Vala source code. This package also contains the vala-gen-introspect and vapigen binaries that will automatically generate Vala bindings. . This package contains the bundled vapi files, which make some common libraries available for vala development.
Homepage: https://wiki.gnome.org/Projects/Vala/
Version: 0.40.4-1
Section: universe/devel