py310-torchvision @0.15.2: No sympy found; NameError: name 'sympy' is not defined

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-11_arm64-builder/builds/98027/steps/install-port/logs/stdio

No sympy found
Traceback (most recent call last):
  File "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_python_py-torchvision/py310-torchvision/work/vision-0.15.2/setup.py", line 9, in <module>
    import torch
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/__init__.py", line 1465, in <module>
    from . import _meta_registrations
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_meta_registrations.py", line 7, in <module>
    from torch._decomp import _add_op_to_registry, global_decomposition_table, meta_table
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_decomp/__init__.py", line 169, in <module>
    import torch._decomp.decompositions
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_decomp/decompositions.py", line 10, in <module>
    import torch._prims as prims
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_prims/__init__.py", line 33, in <module>
    from torch._subclasses.fake_tensor import FakeTensor, FakeTensorMode
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_subclasses/__init__.py", line 3, in <module>
    from torch._subclasses.fake_tensor import (
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_subclasses/fake_tensor.py", line 13, in <module>
    from torch._guards import Source
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_guards.py", line 78, in <module>
    class ShapeGuard(NamedTuple):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/torch/_guards.py", line 79, in ShapeGuard
    expr: sympy.Expr
NameError: name 'sympy' is not defined