[MacPorts] #59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK

[MacPorts]

#59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK
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  Reporter:  gverm    |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.1
Resolution:           |   Keywords:
      Port:  libgcc9  |
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Comment (by gverm):

 Replying to [ticket:59340 gverm]:
 > I patched/configured MacPorts to always use the 10.13 SDK.\\
 I did this by setting macosx_deployment_target 10.13 & macosx_sdk_version
 10.13 in macports.conf.

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Ticket URL: <https://trac.macports.org/ticket/59340#comment:1>
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