[MacPorts] #58770: gpsd @3.19: fails to build in trace mode

[MacPorts]

#58770: gpsd @3.19: fails to build in trace mode
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  Reporter:  Ionic   |      Owner:  Ionic
      Type:  defect  |     Status:  closed
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.99
Resolution:  fixed   |   Keywords:  tracemode
      Port:  gpsd    |
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Comment (by neverpanic):

 OK, so I've tried without your change it is still fails, which suggests
 that `DEVELOPER_DIR` is not being set in the environment. This may be a
 SCons-specific issue…

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Ticket URL: <https://trac.macports.org/ticket/58770#comment:6>
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