Install libgtk-3-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libgtk-3-dev
Description:
development files for the GTK+ library
GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites. . This package contains the header and development files which are needed for building GTK+ applications.
Homepage: https://www.gtk.org/
Version: 3.22.30-1ubuntu1
Section: libdevel