[MacPorts] #60506: Can't install grass7

[MacPorts]

#60506: Can't install grass7
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  Reporter:  dershow  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  grass7   |
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Comment (by nilason):

 The reason I still believe it **might** be related to the python is that
 the executables in build are all (I think) python files starting with
 `#!/usr/bin/env python3`. E.g. `tools/thumbnails.py` calls `g.remove` in
 library.

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Ticket URL: <https://trac.macports.org/ticket/60506#comment:13>
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