[MacPorts] #56988: expat upgrade fails on configure step

[MacPorts]

#56988: expat upgrade fails on configure step
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 Reporter:  mmilenko  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.5.3
 Keywords:            |       Port:  expat
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 It complains that "docbook2man was found to work with SGML rather than
 XML". I tried doing what the log says, setting DOCBOOK_TO_MAN="xmlto man
 --skip-validation" and running sudo with -E, but no luck. The other
 recommendation, installing docbook2X, doesn't help either since docbook2X
 itself depends on expat.

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Ticket URL: <https://trac.macports.org/ticket/56988>
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