[MacPorts] #68340: go @1.17.13_0: environment variables for olders macOS versions cause bash to print "wrong substitution" and thus compiles fail.

[MacPorts]

#68340: go @1.17.13_0: environment variables for olders macOS versions cause bash
to print "wrong substitution" and thus compiles fail.
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  Reporter:  garoffoli  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  go         |
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Comment (by kencu):

 the instructions don’t say it explicitly, but they are for Portfile
 additions, not for bash .profile  additions.

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Ticket URL: <https://trac.macports.org/ticket/68340#comment:2>
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