[MacPorts] #57551: cmake @3.12.4 does not build on Mac OS X 10.4.11, Tiger, because it does not knaw hat unsetenv() does no exist here

[MacPorts]

#57551: cmake @3.12.4 does not build on Mac OS X 10.4.11, Tiger, because it does
not knaw hat unsetenv() does no exist here
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  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.4
Resolution:             |   Keywords:  titger
      Port:             |
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Changes (by michaelld):

 * cc: kencu (added)


Comment:

 @kencu: Is this a function we can get into "macports-legacy-support"?
 Seems like an obvious addition!

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Ticket URL: <https://trac.macports.org/ticket/57551#comment:1>
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