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add_pyrex_extension('bzrlib._chk_map_pyx')
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ext_modules.append(Extension('bzrlib._patiencediff_c',
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['bzrlib/_patiencediff_c.c']))
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if have_pyrex and pyrex_version_info < (0, 9, 6, 3):
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print('Your Pyrex/Cython version %s is too old to build the simple_set' % (