[MacPorts] #64903: Libreoffice installs dependencies and then fails because it is for 10.15

[MacPorts]

#64903: Libreoffice installs dependencies and then fails because it is for 10.15
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  Reporter:  angelog0     |      Owner:  Tatsh
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  libreoffice  |
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Comment (by Tatsh):

 >Shouldn't the user have been notified earlier that MacPorts version of
 libreoffice requests macOS 10.15?

 Unfortunately this feature does not exist yet. The code (not declarations
 like dependencies) that's within a port file is only ever run when the
 port is about to be installed. The code that stops this port from
 installing on < 10.15 is an example.

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Ticket URL: <https://trac.macports.org/ticket/64903#comment:2>
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