Install libags-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libags-dev
Description:
Advanced Gtk+ Sequencer core library (Development files)
libags is a general purpose application context library built upon GObject providing persistence and configuration. It allows you to organize threads in a tree hierarchy that is synced 1000 times per second per default. Since it is written in a object orientated manner you might want to override its default behaviour. . This package includes the needed header files to develop with Advanced Gtk+ Sequencer base library.
Homepage: https://nongnu.org/gsequencer
Version: 1.4.24-1ubuntu2
Section: universe/libdevel