[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 rjvbertin@…):

 OK, I'll have to read up on the standard paths issue.... (when http://qt-
 project.org/doc/qt-5/qstandardpaths.html is back up. ..)
 But as to xdg ... what's to keep us from having configuration files under
 ${prefix}/etc/xdg(/qtchooser/*.conf) ? There seem to be a few
 xdg/freedesktop related ports already, after all ...

 As to the parallel installation issue, I agree with Michael. Linux
 packagers have found a certain number of solutions, among which qtchooser
 (http://manpages.ubuntu.com/manpages/trusty/en/man1/qtchooser.1.html).

 I cannot evaluate how many ports there are now that depend on Qt5, but I
 would guess that there are (many) more ports that require Qt4 than Qt5.
 (Edit: I count 6 Portfiles that contain the string qt5, apart from qt5-mac
 and qt5-creator ... and that includes pyqt5...). So the most safe approach
 would probably be to leave Qt4 where it is as far as that's possible OR by
 default link tools like qmake to the Qt4 version.

 There might also be the option to use versioned frameworks, but I have
 never understood how (and if...) that actually works without specifying
 all paths by hand...

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Ticket URL: <https://trac.macports.org/ticket/44193#comment:19>
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