gtk-sharp2-gapi 2.12.40-2 (amd64 binary) in ubuntu bionic

 GTK# 2.10 is a CLI (.NET) language binding for the GTK+ 2.10 toolkit
 .
 This package includes the parser and code generator used by the GTK#
 project to parse and bind GObject libraries. Install if you want to
 bind GObject-based libraries, or need to compile a project that uses
 it to bind such a library.