[MacPorts] #61384: sbcl build failure 10.11

[MacPorts]

#61384: sbcl build failure 10.11
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  Reporter:  dyne2meter  |      Owner:  easye
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.3
Resolution:              |   Keywords:
      Port:  sbcl        |
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Comment (by kencu):

 for most of these issues, the most expedient fix is to use the
 legacysupport PG, which adds the functionality in macports-legacy-support
 to older SDKs.

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Ticket URL: <https://trac.macports.org/ticket/61384#comment:7>
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