commit 8161523536289eaed01ca42707f6785f59343cd7
Author: Fernando Perez <Fernando.Perez@berkeley.edu>
Date:   Tue Oct 26 14:32:10 2010 -0700

    Do not require GTK to be either present or usable to start.
    
    Before, we only checked that we could import GTK, but in a linux
    console, it's possible to import it while not being able to start it
    (no X11 present).
    
    This should resolve https://bugzilla.redhat.com/show_bug.cgi?id=646079
    Thanks to Tom Spura for reporting it.

diff --git a/IPython/Shell.py b/IPython/Shell.py
index 9481099..38006d7 100644
--- a/IPython/Shell.py
+++ b/IPython/Shell.py
@@ -1152,7 +1152,8 @@ class IPShellMatplotlibQt4(IPShellQt4):
 def check_gtk(mode):
     try:
         import gtk
-    except ImportError:
+    except (ImportError, RuntimeError):
+        # GTK not present, or can't be started (no X11, happens in console)
         return mode
     if hasattr(gtk,'set_interactive'):
         gtk.set_interactive(False)
@@ -1243,7 +1244,8 @@ def _select_shell(argv):
             th_mode = 'tkthread'
 
         # New versions of pygtk don't need the brittle threaded support.
-        th_mode = check_gtk(th_mode)
+        if th_mode == 'gthread':
+            th_mode = check_gtk(th_mode)
         return th_shell[th_mode]