[MacPorts] #58518: bazel @0.25.2: fatal error: 'sys/qos.h' file not found

[MacPorts]

#58518: bazel @0.25.2: fatal error: 'sys/qos.h' file not found
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  Reporter:  ryandesign  |      Owner:  RootFunction
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  mavericks
      Port:  bazel       |
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Comment (by cjones051073):

 This header is only present in macOS 10.10 and above, so yes, older builds
 will fail. I will update the portfile to indicate this. On older systems,
 you can use bazel21 instead.

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Ticket URL: <https://trac.macports.org/ticket/58518#comment:1>
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