[MacPorts] #61772: owncloud-client @ 2.7.2: CMake Error: Could not find a configuration file for package "Qt5" that is compatible

[MacPorts]

#61772: owncloud-client @ 2.7.2: CMake Error: Could not find a configuration file
for package "Qt5" that is compatible
------------------------------+-------------------------
  Reporter:  thetrial         |      Owner:  Schamschula
      Type:  defect           |     Status:  reopened
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.4
Resolution:                   |   Keywords:  elcapitan
      Port:  owncloud-client  |
------------------------------+-------------------------

Comment (by Schamschula):

 How?

 I don't have any machines running very old macOS versions (other than
 unpowwered, stored in the closet), and don't have time maintain a fleet of
 virtual machines. I'm much more concerned in getting it running on my
 Apple SoC Mac mini. Currently qt5-qtwebkit is a blocker.

 Regressing older macOS versions to 2.6.3 didn't require any testing, as
 everything built before.

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Ticket URL: <https://trac.macports.org/ticket/61772#comment:28>
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