[MacPorts] #58767: libsdl2 build failure

[MacPorts]

#58767: libsdl2 build failure
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  Reporter:  dyne2meter  |      Owner:  jmroot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libsdl2     |
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Comment (by kencu):

 seems like it built on every system except 10.11
 <https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/90789/steps
 /install-port/logs/stdio>.

 I would imagine this patch <http://hg.libsdl.org/SDL/rev/75dad4c8914e>
 needs to be tweaked to include `10.11` based on this.

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Ticket URL: <https://trac.macports.org/ticket/58767#comment:3>
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