[MacPorts] #50241: graphite2: fatal error: 'unistd.h' file not found

[MacPorts]

#50241: graphite2: fatal error: 'unistd.h' file not found
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  Reporter:  jam@…      |      Owner:  ryandesign@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:             |   Keywords:  elcapitan
      Port:  graphite2  |
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Comment (by jam@…):

 The compile times listed are on an old (2 core) mac mini and for the whole
 build of xfce.
 The log is proof that the fail occured but after re-downloading CLI tools
 for xcode everything worked for me too. Hence my frustrated lament above

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Ticket URL: <https://trac.macports.org/ticket/50241#comment:5>
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