[MacPorts] #60506: Can't install grass7

[MacPorts]

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

Comment (by dershow):

 {{{
 $ port select --list python
 Available versions for python:
         none
         python27 (active)
         python27-apple
         python36
         python37
         python38

 }}}

 I don't see an explicit "DYLD_LIBRARY_PATH" paragraph from man ld.
 Although dyld appears a bunch.

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Ticket URL: <https://trac.macports.org/ticket/60506#comment:15>
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