[MacPorts] #57577: qt4-mac : set the graphicssystem via qtconfig

[MacPorts]

#57577: qt4-mac : set the graphicssystem via qtconfig
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  Reporter:  RJVB         |      Owner:  michaelld
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  qt4-mac      |
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Comment (by michaelld):

 I have no objections to your patches per se, but I do want to verify
 building & runtime on various OSX versions before anything else.

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Ticket URL: <https://trac.macports.org/ticket/57577#comment:7>
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