[MacPorts] #49583: glib2 failed to build on 10.11.1

[MacPorts]

#49583: glib2 failed to build on 10.11.1
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  Reporter:  r.v.sergeev@…  |      Owner:  ryandesign@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.3.4
Resolution:                 |   Keywords:  elcapitan
      Port:  glib2          |
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Comment (by elatllat@…):

 macports should check this and tell the user to upgrade Xcode instead of
 attempting and failing to build.

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Ticket URL: <https://trac.macports.org/ticket/49583#comment:7>
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