[MacPorts] #61108: LyX fails to build because wrong compiler

[MacPorts]

#61108: LyX fails to build because wrong compiler
---------------------+----------------------------
  Reporter:  metbic  |      Owner:  kurthindenburg
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.3
Resolution:          |   Keywords:  yosemite
      Port:  LyX     |
---------------------+----------------------------

Comment (by kencu):

 this seems to be killing the newest of the failures on the buildbot:
 {{{
 linkback/LinkBackServer.m:175:23: error: use of undeclared identifier
 'NSAlertStyleCritical'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61108#comment:3>
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