% git clean -ffdx
...
% MODE=debug USE_PY39=true ./pants
...
    Finished dev [unoptimized + debuginfo] target(s) in 55.23s
Traceback (most recent call last):
  File "/Users/yic/workspace/oss_pants/src/python/pants/bin/pants_loader.py", line 19, in <module>
    from pants.bin.pants_runner import PantsRunner
  File "/Users/yic/workspace/oss_pants/src/python/pants/bin/pants_runner.py", line 13, in <module>
    from pants.engine.environment import CompleteEnvironment
  File "/Users/yic/workspace/oss_pants/src/python/pants/engine/environment.py", line 10, in <module>
    from pants.engine.rules import collect_rules, rule
  File "/Users/yic/workspace/oss_pants/src/python/pants/engine/rules.py", line 25, in <module>
    from pants.engine.engine_aware import SideEffecting
  File "/Users/yic/workspace/oss_pants/src/python/pants/engine/engine_aware.py", line 9, in <module>
    from pants.engine.internals import native_engine
ImportError: dlopen(/Users/yic/workspace/oss_pants/src/python/pants/engine/internals/native_engine.so, 0x0002): tried: '/Users/yic/workspace/oss_pants/src/python/pants/engine/internals/native_engine.so' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64')), '/usr/lib/native_engine.so' (no such file)