--- matplotlib-0.98.5.3/src/swig_runtime.h.old	2008-12-15 06:34:58.000000000 -0800
+++ matplotlib-0.98.5.3/src/swig_runtime.h	2008-12-30 23:38:49.000000000 -0800
@@ -856,7 +856,7 @@
     Py_DECREF(old_str);
     Py_DECREF(value);
   } else {
-    PyErr_Format(PyExc_RuntimeError, mesg);
+    PyErr_Format(PyExc_RuntimeError, "%s", mesg);
   }
 }