[MacPorts] #54531: cmake 3.9.0: upgrade from 3.8.2_0 fails in make with urllib3 distribution not found (eventually)

[MacPorts]

#54531: cmake 3.9.0: upgrade from 3.8.2_0 fails in make with urllib3 distribution
not found (eventually)
---------------------------+-------------------
  Reporter:  sambthompson  |      Owner:
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.1
Resolution:                |   Keywords:
      Port:  cmake         |
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Comment (by michaelld):

 Building "cmake -docs" works for me.

 The issue is with Sphinx, when building documentation (try executing
 "sphinx-build-2.7 --help" to see the same error as generated when trying
 to build cmake). Sphinx uses py27-requests, which in turn uses urllib3.
 Thus, the actual issue is with py27-requests. It's __init__.py script does
 the check for urllib3, but I think there's an error in the code.

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Ticket URL: <https://trac.macports.org/ticket/54531#comment:2>
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