diff --git a/IPython/frontend/terminal/ipapp.py b/IPython/frontend/terminal/ipapp.py
index f496e2f..fac3486 100755
--- a/IPython/frontend/terminal/ipapp.py
+++ b/IPython/frontend/terminal/ipapp.py
@@ -229,8 +229,8 @@ class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):
             self.load_config_file = lambda *a, **kw: None
             self.ignore_old_config=True
 
-    gui = CaselessStrEnum(('qt','wx','gtk', 'pyglet'), config=True,
-        help="Enable GUI event loop integration ('qt', 'wx', 'gtk', 'pyglet')."
+    gui = CaselessStrEnum(('qt', 'wx', 'gtk', 'glut', 'pyglet'), config=True,
+        help="Enable GUI event loop integration ('qt', 'wx', 'gtk', 'glut', 'pyglet')."
     )
     pylab = CaselessStrEnum(['tk', 'qt', 'wx', 'gtk', 'osx', 'auto'],
         config=True,