You're building libgtk-x11-2.0 right there. The problem is you're probably linking against an outdated version of glib. Install glib-2.4, or if you've already ...

after installing the GNU ADA compiler and associated Gtk+ binding, I tried to compile an example gtk program. It failed because although the Gtk binding was installed correctly, Gtk was ...

GTK+ is a runtime environment that applies to a number of operating systems. If you create an interface for a program, GTK runtime should be installed on the users’ computers so that the program runs.