[MacPorts] #61640: mpich-default @3.3.2 build error: Undefined symbols for architecture x86_64

[MacPorts]

#61640: mpich-default @3.3.2 build error: Undefined symbols for architecture x86_64
----------------------------+----------------------
  Reporter:  ccottap        |      Owner:  eborisch
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.4
Resolution:                 |   Keywords:
      Port:  mpich-default  |
----------------------------+----------------------

Comment (by ccottap):

 Following #61584, I added


 {{{
 macosx_deployment_target 10.16
 }}}


 to macports.conf and mpich-default could be successfully built.

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Ticket URL: <https://trac.macports.org/ticket/61640#comment:3>
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