See the file 'INSTALL'
+Notes about GLib 2.30
+=====================
+
+* GObject includes a generic marshaller, g_cclosure_marshal_generic.
+ To use it, simply specify NULL as the marshaller in g_signal_new().
+ The generic marshaller is implemented with libffi, and consequently
+ GObject depends on libffi now.
+
Notes about GLib 2.28
=====================