I'm getting this error when cythonizing 
sage/numerical/backends/coin_backend.pyx (using systemwide cython version 
0.22), any ideas? It works fine in 6.6

Cythonizing sage/numerical/backends/coin_backend.pyx

Error compiling Cython file:
------------------------------------------------------------
...
        """

        cdef char * lp = "lp"
        self.si.writeLp(filename, lp, 0.00001, 10, 5, -1 if 
self.is_maximization() else 1, 1)

    cpdef problem_name(self, char * name = NULL):
                                          ^
------------------------------------------------------------

sage/numerical/backends/coin_backend.pyx:1116:43: Invalid compile-time 
expression
Traceback (most recent call last):
  File "setup.py", line 567, in <module>
    run_cythonize()
  File "setup.py", line 559, in run_cythonize
    'profile': profile,
  File "/usr/lib/python2.7/site-packages/Cython/Build/Dependencies.py", 
line 865, in cythonize
    cythonize_one(*args[1:])
  File "/usr/lib/python2.7/site-packages/Cython/Build/Dependencies.py", 
line 985, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: 
sage/numerical/backends/coin_backend.pyx

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