Binary package “libgtk-3-dev” in ubuntu focal

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.

Published versions