gnu: python-ipython: Patch 'ctypes' bug.

* gnu/packages/patches/python-ipython-inputhook-ctype.patch: New patch.
* gnu/packages/python.scm (python-ipython): Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu-system.am

@@ -640,6 +640,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/python-3-search-paths.patch		\
   gnu/packages/patches/python-disable-ssl-test.patch		\
   gnu/packages/patches/python-fix-tests.patch			\
+  gnu/packages/patches/python-ipython-inputhook-ctype.patch	\
   gnu/packages/patches/python2-rdflib-drop-sparqlwrapper.patch	\
   gnu/packages/patches/python-configobj-setuptools.patch	\
   gnu/packages/patches/python2-pygobject-2-gi-info-type-error-domain.patch \

gnu/packages/patches/python-ipython-inputhook-ctype.patch

@@ -0,0 +1,41 @@
+From 04c5d358c7ab74d3ddab4f7662e539393d8604c6 Mon Sep 17 00:00:00 2001
+From: Lucretiel <Lucretiel@users.noreply.github.com>
+Date: Wed, 13 May 2015 13:12:43 -0400
+Subject: [PATCH] register now checks for missing ctypes
+
+If ctypes is None, then no input hooks may be registered; `InputHookManager.register` skips registration of input hook classes. Also updated `__init__` to no longer skip creating the instance attributes, to prevent AttributeError exceptions at load time.
+---
+ IPython/lib/inputhook.py | 13 +++++++------
+ 1 file changed, 7 insertions(+), 6 deletions(-)
+
+diff --git a/IPython/lib/inputhook.py b/IPython/lib/inputhook.py
+index 4ae2cb3..6578365 100644
+--- a/IPython/lib/inputhook.py
++++ b/IPython/lib/inputhook.py
+@@ -107,8 +107,8 @@ class InputHookManager(object):
+     def __init__(self):
+         if ctypes is None:
+             warn("IPython GUI event loop requires ctypes, %gui will not be available")
+-            return
+-        self.PYFUNC = ctypes.PYFUNCTYPE(ctypes.c_int)
++        else:
++            self.PYFUNC = ctypes.PYFUNCTYPE(ctypes.c_int)
+         self.guihooks = {}
+         self.aliases = {}
+         self.apps = {}
+@@ -197,10 +197,11 @@ def enable(self, app=None):
+                     ...
+         """
+         def decorator(cls):
+-            inst = cls(self)
+-            self.guihooks[toolkitname] = inst
+-            for a in aliases:
+-                self.aliases[a] = toolkitname
++            if ctypes is not None:
++                inst = cls(self)
++                self.guihooks[toolkitname] = inst
++                for a in aliases:
++                    self.aliases[a] = toolkitname
+             return cls
+         return decorator
+ 

gnu/packages/python.scm

@@ -4195,6 +4195,7 @@ without using the configuration machinery.")
     (source
      (origin
        (method url-fetch)
+       (patches (list (search-patch "python-ipython-inputhook-ctype.patch")))
        (uri (string-append "https://pypi.python.org/packages/source/i/"
                            "ipython/ipython-" version ".tar.gz"))
        (sha256