[MacPorts] #56837: textmate2: parsing Portfile fails on on OS 10.10

[MacPorts]

#56837: textmate2: parsing Portfile fails on on OS 10.10
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  Reporter:  petrrr     |      Owner:  neverpanic
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.3
Resolution:             |   Keywords:
      Port:  textmate2  |
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Comment (by kencu):

 a graceful error indicating a need for 10.11 or greater would be ideal, I
 think. It should somehow fall through to the system test and error there,
 rather than the mysterious error about sdkroot which is not too
 enlightening.

 What do you think?

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Ticket URL: <https://trac.macports.org/ticket/56837#comment:3>
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