[MacPorts] #67333: Something has broken down in libupnp configure: add_subdirectory given source "gtest" which is not an existing directory

[MacPorts]

#67333: Something has broken down in libupnp configure: add_subdirectory given
source "gtest" which is not an existing directory
---------------------------+------------------------
  Reporter:  barracuda156  |      Owner:  ctreleaven
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  libupnp       |
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Comment (by ctreleaven):

 Could you please attach the complete build log.

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Ticket URL: <https://trac.macports.org/ticket/67333#comment:1>
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