[MacPorts] #55291: boost @1.65.1 +no_single+python36: link=shared together with runtime-link=static is not allowed

[MacPorts]

#55291: boost @1.65.1 +no_single+python36: link=shared together with runtime-
link=static is not allowed
---------------------+------------------------
  Reporter:  slarew  |      Owner:  ryandesign
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.4.2
Resolution:          |   Keywords:
      Port:  boost   |
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Comment (by ryandesign):

 We were not previously using `runtime_link`, only `link`. You added
 `runtime_link` in #50671 so maybe that's related.

 librets requires boost's no_static variant. Though it's the only port I
 can find that does so. Maybe that can be fixed.

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Ticket URL: <https://trac.macports.org/ticket/55291#comment:5>
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