[MacPorts] #59239: sundials: builds fail on 10.6 buildbots; (was: mpich-default uses clang-8.0 at runtime but doesn't declare a dependency on it)

[MacPorts]

#59239: sundials: builds fail on 10.6 buildbots; (was: mpich-default uses clang-8.0
at runtime but doesn't declare a dependency on it)
-----------------------------+----------------------
  Reporter:  ryandesign      |      Owner:  mascguy
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.1
Resolution:                  |   Keywords:
      Port:  sundials mpich  |
-----------------------------+----------------------

Comment (by mascguy):

 This issue a bit different now, as `mpich +clang90` is being requested on
 10.6, even though that combination isn't supported. So I'll have to add
 some debug output to the mpi portgroup, to see what's happening.

 However, when a valid 10.6 `mpich` variant is requested - such as `mpich
 +gcc7` - builds succeed. As do those with `openmpi`, such as `openmpi
 +clang90`.

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Ticket URL: <https://trac.macports.org/ticket/59239#comment:7>
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