[MacPorts] #62220: KeePassXC @2.6.4: no member named 'MacOSBigSur' in 'QOperatingSystemVersion'

[MacPorts]

#62220: KeePassXC @2.6.4: no member named 'MacOSBigSur' in
'QOperatingSystemVersion'
------------------------+-----------------------
  Reporter:  thetrial   |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  elcapitan
      Port:  KeePassXC  |
------------------------+-----------------------

Comment (by macportsraf):

 I'm getting this error on 10.14.

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Ticket URL: <https://trac.macports.org/ticket/62220#comment:5>
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