[MacPorts] #42011: perl5.12: error: Availability.h: No such file or directory

[MacPorts]

#42011: perl5.12: error: Availability.h: No such file or directory
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  Reporter:  byf1658@…  |      Owner:  macports-tickets@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.2.1
Resolution:             |   Keywords:
      Port:  perl5.12   |
------------------------+--------------------------------

Comment (by ryandesign@…):

 If it fails again, check if /usr/include/Availability.h exists. If not, or
 if /usr/include itself doesn't exist, you haven't installed the Xcode
 command line tools, which are required for MacPorts. Instructions for
 installing them vary based on OS X version; see our documentation.

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Ticket URL: <https://trac.macports.org/ticket/42011#comment:2>
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