[MacPorts] #58737: `port fetch qt5-qtbase` does not fetch distfiles on macOS 10.15 (was: `port fetch qt5-qtbase` does not fetch distfiles)

[MacPorts]

#58737: `port fetch qt5-qtbase` does not fetch distfiles on macOS 10.15
-------------------------+---------------------------------
  Reporter:  king7532    |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:  catalina
      Port:  qt5-qtbase  |
-------------------------+---------------------------------
Changes (by jmroot):

 * keywords:   => catalina


Comment:

 {{{
 DEBUG: macOS 10.15 (darwin/19.0.0) arch i386
 }}}
 Maybe lead with that. The port does lots of fiddling based on the OS
 version.

 Be aware of wiki:FAQ#prerelease

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Ticket URL: <https://trac.macports.org/ticket/58737#comment:2>
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