[MacPorts] #60246: git 2.25.1_0 +credential_osxkeychain +diff_highlight +doc +pcre +perl5_28]: fails to install, 'unistd.h' file not found

[MacPorts]

#60246: git 2.25.1_0 +credential_osxkeychain +diff_highlight +doc +pcre +perl5_28]:
fails to install, 'unistd.h' file not found
--------------------------+--------------------
  Reporter:  jlargentaye  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  git          |
--------------------------+--------------------
Changes (by jlargentaye):

 * Attachment "main.log" added.

 Build failure log for git-2.25.1 with Xcode 12 preview

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Ticket URL: <https://trac.macports.org/ticket/60246>
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