[MacPorts] #42126: Mercurial build failure and 'sudo port upgrade outdated' failure on 10.7.5

[MacPorts]

#42126: Mercurial build failure and 'sudo port upgrade outdated' failure on 10.7.5
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  Reporter:  netja000@…      |      Owner:  deric@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.2.1
Resolution:                  |   Keywords:
      Port:  mercurial swig  |
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Comment (by netja000@…):

 Yes, I clean the port before trying again. And the command line tools are
 installed, since I checked the preference of Xcode. I'll attach the
 screenshot here.

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Ticket URL: <https://trac.macports.org/ticket/42126#comment:6>
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