[MacPorts] #50241: graphite2: fatal error: 'unistd.h' file not found (was: xfce el Capitan fails to build)

[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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Changes (by ryandesign@…):

 * keywords:   => elcapitan


Comment:

 I can't reproduce this problem on my El Capitan system. Check if
 /usr/include/unistd.h exists. If it does not, then you haven't
 successfully installed the command line developer tools.

 Building graphite2 takes under a minute, not hours.

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Ticket URL: <https://trac.macports.org/ticket/50241#comment:4>
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