A new release of the development versions of GTK+ and associated libraries (GLib, Pango, Atk) is available. This is a an unstable preview release and should not be used in production. This release is incompatible with GTK+ and GLib 1.2.x and software that has not been explicitly ported will not compile with this version. GTK+ 1.3.7 is the unstable version that will result to GTK+ 2.0 which is the next major version of GTK+ and the one which Gnome 2.0 will be based on.