libgtk2.0-dev-dbgsym 2.24.29-1ubuntu1 (amd64 binary) in ubuntu xenial

 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 files and static libraries which are
 needed for developing GTK+ applications.