[MacPorts] #62174: cmake @3.19.3 tries to use sphinx-build-3.6

[MacPorts]

#62174: cmake @3.19.3 tries to use sphinx-build-3.6
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  Reporter:  EJFielding  |      Owner:  michaelld
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:  fixed       |   Keywords:
      Port:  cmake       |
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Comment (by ryandesign):

 Whatever python version of sphinx it was using to build with docs on your
 system, you must've had it installed already. The reporter didn't. I'm
 presuming here that you did actually test the docs variant.

 The buildbot and CI systems only build default variants. docs isn't a
 default variant of this port.

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Ticket URL: <https://trac.macports.org/ticket/62174#comment:7>
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