[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@…):

 I just discovered another potential option.

 When I tried to install Qt's own 5.3 binaries through their installer,
 this failed on the step that adapts the "rpath" information to the chosen
 install path (the shipped binaries have a very long ___PADDING___ string
 in their path, for that purpose. However, they depend on libstdc++, so I
 could install to the intended location on my 10.9 VM, and then copy that
 tree to the 10.6 host. Works a charm.
 Evidently I could have picked a location in /opt/local.

 I still haven't grasped what the QStandardPath issue is that Marko is
 working on, or if there are (other) modifications to the Qt source code to
 cater for use by MacPorts. But barring those, it seems MacPorts could host
 a binary package created on 10.7 or newer of an install to
 /opt/local/<whatever>/qt/5, with symlinks to the usual locations (and
 qtchooser to help have both 4 and 5 installed in parallel).

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Ticket URL: <https://trac.macports.org/ticket/44193#comment:16>
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