Compile error under master branch of Cython but not v0.19.2

base.pxd

import numpy as np
cimport numpy as np

cdef unsigned int fix

base.pyx

class BFact:
    def run(self, indx):
        return 0.0

cpdef set_fix(unsigned int n_fix):

    global fix
    fix = n_fix

f0001.pyx

from base import *
from base cimport *

class thisfact(BFact):
    def run(self, np.int32_t indx):

        return 2.0 * indx

setup.py

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize
import Cython.Compiler.Options
import os, glob
import numpy


numpy_include = numpy.get_include()
bitf = '-mno-ms-bitfields'

_include = ['.', numpy_include]
_extra = ['-O3', '-w', bitf]


extensions = []

_module = 'base'
extensions.append(
    Extension(_module, ['{}.pyx'.format(_module)], 
        #depends=_depends,
        include_dirs=_include,
        extra_compile_args=_extra))

_depends = ['base.pxd']

setup(
    name = "",
    ext_modules = cythonize(extensions),
)


extensions = []
filenames = glob.glob('f[0-9][0-9][0-9][0-9].pyx')
for filename in filenames:
    _module = os.path.basename(filename)[:-4]
    extensions.append(
        Extension(_module, ['{}.pyx'.format(_module)],
            depends=_depends,
            include_dirs=_include,
            extra_compile_args=_extra))

cy_extensions = cythonize(extensions)

setup(
    name = "",
    ext_modules = cy_extensions
)