[MacPorts] #51801: qt5: support older versions of OS X via different versions of Qt 5

[MacPorts]

#51801: qt5: support older versions of OS X via different versions of Qt 5
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  Reporter:  dliessi      |      Owner:  MarcusCalhoun-Lopez
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  qt5          |
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Comment (by MarcusCalhoun-Lopez):

 In [changeset:"d1509f4a680e5873f3d5bb80b49ce0813dbf269a/macports-ports"
 d1509f4a/macports-ports]:
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="d1509f4a680e5873f3d5bb80b49ce0813dbf269a"
 qt5-1.0.tcl: begin building infrastructure to support
 different versions of Qt 5

 Qt can make major functionality changes between minor version changes.
 see https://github.com/Homebrew/homebrew-versions/pull/1191

 Qt 5.6 is a long term support release which means MacPorts may
     want to keep it around for a while.
 see https://blog.qt.io/blog/2015/12/18/introducing-long-term-support/

 If possible, we want to support as many versions of macOS as we can.
 This sometimes means installing an older version of Qt.
 see https://trac.macports.org/ticket/51801

 Finally, Qt requires substantial patches to KDE Frameworks 5, which
     necessitates a separate port.
 see https://trac.macports.org/ticket/48967
 }}}

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Ticket URL: <https://trac.macports.org/ticket/51801#comment:4>
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