py27-libxml2.2.7.8nb1 no Parser found

["Maurizio Caloro" <mauric%gmx.ch@localhost>]

Hello
After reading that "py27-expat" are necesseary so rebuild this package
but py-libxml2 always put the message "No parser found".
thanks
Mauri

[textproc/py-libxml2]
[Snip] ... setup.py  build  )
failed to find and generate stubs for libxml2, aborting ...
<class 'xml.sax._exceptions.SAXReaderNotAvailable'> No parsers found
*** Error code 1

# python2.7
Python 2.7.3 (default, Jun  5 2012, 09:21:07) 
[GCC 4.1.3 20080704 prerelease (NetBSD nb2 20081120)] on netbsd5
Type "help", "copyright", "credits" or "license" for more information.
>>> import xml.sax
>>> parser = xml.sax.make_parser()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/pkg/lib/python2.7/xml/sax/__init__.py", line 93, in make_parser
    raise SAXReaderNotAvailable("No parsers found", None)
xml.sax._exceptions.SAXReaderNotAvailable: No parsers found
>>>quit

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