The optional package ChomP installs cleanly but then does not actually work 
on Sage 6.1.1 on OS X Mavericks.  The specific error I get on both 
platforms is below. 

    Best,

    Nathan


sage: from sage.interfaces.chomp import CHomP

sage: T = cubical_complexes.Torus()

sage: CHomP()('homcubes', T)

---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

<ipython-input-3-0b7dec9d6204> in <module>()

----> 1 CHomP()('homcubes', T)


/pkgs/sage-6.1/local/lib/python2.7/site-packages/sage/interfaces/chomp.pyc 
in __call__(self, program, complex, subcomplex, **kwds)

    288                     hom = VectorSpace(base_ring, 0)

    289                 else:

--> 290                     hom = HomologyGroup(0)

    291             else:

    292                 rk = 0


TypeError: HomologyGroup() takes at least 2 arguments (1 given)

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