[MacPorts] #55586: itstool @2.0.2: error: Python module libxml2 is needed to run this package

[MacPorts]

#55586: itstool @2.0.2: error: Python module libxml2 is needed to run this package
------------------------+-----------------------
  Reporter:  ballapete  |      Owner:  dbevans
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:  elcapitan
      Port:  itstool    |
------------------------+-----------------------

Comment (by ryandesign):

 It is a similar situation to the one which caused me to have to
 [changeset:106049 remove the +q8, +q16, +q32 and +hdri variants from
 ImageMagick] and the reason why the [https://github.com/macports/macports-
 ports/pull/437 proposed +zts variant for php] has not been added.

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Ticket URL: <https://trac.macports.org/ticket/55586#comment:4>
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