[MacPorts] #72572: An error on libgit2-1.9.0 on macOS 10.13 (High Sierra, inferred from darwin_17) for upgrading

[MacPorts]

#72572: An error on libgit2-1.9.0 on macOS 10.13 (High Sierra, inferred from
darwin_17) for upgrading
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  Reporter:  yoshikazu-tanaka-1961  |      Owner:  (none)
      Type:  defect                 |     Status:  closed
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.10.7
Resolution:  duplicate              |   Keywords:
      Port:  libgit2                |
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Comment (by tomio-arisaka):

 So my temporary workaround is to use legacy-support-devel instead of
 legacy-support.

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Ticket URL: <https://trac.macports.org/ticket/72572#comment:2>
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