[MacPorts] #66925: mpich @4.1 is broken on <10.12: fatal error: os/lock.h: No such file or directory

[MacPorts]

#66925: mpich @4.1 is broken on <10.12: fatal error: os/lock.h: No such file or
directory
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  eborisch
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:  fixed         |   Keywords:
      Port:  mpich         |
---------------------------+----------------------

Comment (by MarcusCalhoun-Lopez):

 I believe this is that type of situation that
 [https://ports.macports.org/port/legacy-support/ legacy-support] was
 designed for.\\
 I opened a [https://github.com/macports/macports-legacy-support/pull/53
 pull request] to partially implement `os/lock.h` using OSSpinLock in
 legacy-support.\\
 mpich could then add something along the lines of
 `legacysupport.newest_darwin_requires_legacy 15`.

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Ticket URL: <https://trac.macports.org/ticket/66925#comment:3>
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