[MacPorts] #56107: make kchmviewer build again, respecting "our" build settings

[MacPorts]

#56107: make kchmviewer build again, respecting "our" build settings
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  Reporter:  RJVB        |      Owner:  mojca
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  haspatch
      Port:  kchmviewer  |
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Comment (by mojca):

 Yes, that's exactly what happened, totally expected/explicable, just not
 what the user might want. I first intended to fix the PG, but then I
 started thinking that we need a general concept of out-of-source builds (I
 just sent an email to the ML).

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Ticket URL: <https://trac.macports.org/ticket/56107#comment:6>
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