[MacPorts] #54547: xdotool compile fails on Sierra, as a result of outdated definitions.

[MacPorts]

#54547: xdotool compile fails on Sierra, as a result of outdated definitions.
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 Reporter:  vjorlikowski  |      Owner:
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:
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 xdotool has an osx_hacks.h header file, intended to define things that
 weren't present in versions of macOS prior to Sierra.

 Sadly - these definitions are now present, and xdotool fails to compile.

 The attached diff allows the compile to complete.
 It should be applied in a version-aware manner - or else, a patch should
 be generated to only include osx_hacks.h for older versions of macOS.

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Ticket URL: <https://trac.macports.org/ticket/54547>
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