[MacPorts] #44193: qt: allow side by side installation of qt4-mac and qt5-mac

[MacPorts]

#44193: qt: allow side by side installation of qt4-mac and qt5-mac
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  Reporter:  mojca@…           |      Owner:  mcalhoun@…
      Type:  enhancement       |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  qt4-mac, qt5-mac  |
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Comment (by michaelld@…):

 Yes, moving Qt4 (back) into libexec, just like Qt5 is now. It's easier to
 debug issues when we know where the install is supposed to be located.
 Ditto for dependencies, and so forth. MacPorts is a control freak ;)

 BTW> Do we want the Qt4 install prefix to match that for Qt5, and be
 ${prefix}/libexec/qt4-mac?  I was just going to use: ${prefix}/libexec/qt4
 for simplicity, since I cannot foresee a time when qt4-x11 is a viable
 alternative. Nor qt5-x11 either, for that matter. Hence, just using "qt4"
 as my preference. Thoughts?

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Ticket URL: <https://trac.macports.org/ticket/44193#comment:45>
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