[MacPorts] #56150: py36-cartopy @0.15.1_2: install fails: setup.py can't find proj

[MacPorts]

#56150: py36-cartopy @0.15.1_2: install fails: setup.py can't find proj
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  Reporter:  mndavidoff  |      Owner:  petrrr
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  py-cartopy  |
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Comment (by platipodium):

 Just to confirm @news24lor solution works for me, and for
 `py27-spatialite`

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Ticket URL: <https://trac.macports.org/ticket/56150#comment:5>
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