Follow-on to 5bb6405 to be safer about the version check in the backend itself.

mdboom · mdboom · commit 8eb36dcec6f8 · 2013-08-26T13:03:38.000-04:00
diff --git a/lib/matplotlib/backends/backend_gtk3.py b/lib/matplotlib/backends/backend_gtk3.py
@@ -10,6 +10,9 @@ def fn_name(): return sys._getframe(1).f_code.co_name
 
 try:
     gi.require_version("Gtk", "3.0")
+except AttributeError:
+    raise ImportError(
+        "pygobject version too old -- it must have require_version")
 except ValueError:
     raise ImportError(
         "Gtk3 backend requires the GObject introspection bindings for Gtk 3 "
