[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):

 I get the same thing on 10.6.8:
 {{{
 $ port info textmate2
 Error: Unable to determine location of a macOS SDK.
 Error: Unable to open port: can't read "configure.sdkroot": Unable to
 determine location of a macOS SDK.
 }}}

 Looking at the portfile, I think the sdk logic needs to be reworked a bit,
 most likely.

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Ticket URL: <https://trac.macports.org/ticket/56837#comment:1>
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