[MacPorts] #50435: mysql55: fatal error: 'sys/types.h' file not found

[MacPorts]

#50435: mysql55: fatal error: 'sys/types.h' file not found
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  Reporter:  s_brandy@…  |      Owner:  pixilla@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  mysql55     |
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Comment (by s_brandy@…):

 Replying to [comment:1 ryandesign@…]:
 > Does the file /usr/include/sys/types.h exist? If not, install the Xcode
 command line tools.

 I installed Xcode7.2, and I also run "Xcode-select --install" in the
 terminal and it finished well, but I don't have a /usr/include folder.
 That's weird!

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Ticket URL: <https://trac.macports.org/ticket/50435#comment:2>
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