py37-setuptools fails on PPC: ERROR Backend subproccess exited when trying to invoke build_wheel

[barracuda156]

--->  Configuring py37-setuptools
--->  Building py37-setuptools
Executing:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setuptools/py37-setuptools/work/setuptools-62.1.0" && /opt/local/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 -m build --wheel --no-isolation --outdir /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setuptools/py37-setuptools/work --skip-dependency-check 
* Building wheel...

ERROR Backend subproccess exited when trying to invoke build_wheel
Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setuptools/py37-setuptools/work/setuptools-62.1.0" && /opt/local/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 -m build --wheel --no-isolation --outdir /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setuptools/py37-setuptools/work --skip-dependency-check 
Exit code: 1
Error: Failed to build py37-setuptools: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setuptools/py37-setuptools/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there
is a bug.
Error: Processing of port py37-setuptools failed

Identical error on 10.4.11 and 10.6.