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(mbp) Refuse to build with pyrex 0.9.4*

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    add_pyrex_extension('bzrlib._walkdirs_win32')
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    z_lib = 'zdll'
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else:
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    if have_pyrex and pyrex_version == '0.9.4.1':
 
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    if have_pyrex and pyrex_version.startswith('0.9.4'):
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        # Pyrex 0.9.4.1 fails to compile this extension correctly
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        # The code it generates re-uses a "local" pointer and
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        # calls "PY_DECREF" after having set it to NULL. (It mixes PY_XDECREF
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        # which is NULL safe with PY_DECREF which is not.)
 
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        # <https://bugs.edge.launchpad.net/bzr/+bug/449372>
 
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        # <https://bugs.edge.launchpad.net/bzr/+bug/276868>
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        print 'Cannot build extension "bzrlib._dirstate_helpers_pyx" using'
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        print 'your version of pyrex "%s". Please upgrade your pyrex' % (
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            pyrex_version,)