[MacPorts] #61492: Cannot build openmpi-gcc10, mpich-gcc10, etc. on macOS 11.0.1 Big Sur, Xcode 12.2

[MacPorts]

#61492: Cannot build openmpi-gcc10, mpich-gcc10, etc. on macOS 11.0.1 Big Sur,
Xcode 12.2
------------------------------+---------------------------
 Reporter:  ChristopherMayes  |      Owner:  (none)
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.6.4
 Keywords:  openmpi-gcc10     |       Port:  openmpi-gcc10
------------------------------+---------------------------
 I am unable to install any *mpi*gcc10 port on the latest macOS 11.0.1 Big
 Sur, Xcode 12.2.

 Full main.log attached

 Undefined symbols for architecture x86_64:
   "_mca_allocator_component_lookup", referenced fr
       _common_sm_mpool_create in common_sm_mpool.o
   "_opal_allocator_base_framework", referenced fro
       _common_sm_mpool_create in common_sm_mpool.o
   "_opal_class_init_epoch", referenced from:
       _attach_and_init in common_sm.o
   "_opal_class_initialize", referenced from:
       _attach_and_init in common_sm.o
   "_opal_compare_proc", referenced from:
       _mca_common_sm_local_proc_reorder in common_
   "_opal_hwloc_base_membind", referenced from:
       _mca_common_sm_mpool_alloc in common_sm_mpoo
   "_opal_list_item_t_class", referenced from:
       _mca_common_sm_module_t_class in common_sm.o
   "_opal_output", referenced from:
       _attach_and_init in common_sm.o
       _common_sm_mpool_create in common_sm_mpool.o
   "_opal_proc_local_get", referenced from:
       _attach_and_init in common_sm.o
   "_opal_shmem_ds_copy", referenced from:
       _attach_and_init in common_sm.o
   "_opal_shmem_segment_attach", referenced from:
       _attach_and_init in common_sm.o
   "_opal_shmem_segment_create", referenced from:
       _mca_common_sm_module_create_and_attach in c
   "_opal_shmem_segment_detach", referenced from:
       _attach_and_init in common_sm.o
       _mca_common_sm_fini in common_sm.o
   "_opal_shmem_unlink", referenced from:
       _mca_common_sm_module_unlink in common_sm.o
   "_opal_show_help", referenced from:
       _attach_and_init in common_sm.o
   "_opal_strerror", referenced from:
       _attach_and_init in common_sm.o
   "_opal_uses_threads", referenced from:
       _sm_module_finalize in common_sm_mpool.o
 ld: symbol(s) not found for architecture x86_64
 collect2: error: ld returned 1 exit status
 make[2]: *** [libmca_common_sm.la] Error 1

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Ticket URL: <https://trac.macports.org/ticket/61492>
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