py36-cffi 1.14.6: build fails

[odysseus9672 (Sean Lake)]

Attempting to upgrade py36-cffi, and the build fails. Here's the part of the build log I think is relevant:

:debug:build system: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-cffi/py36-cffi/work/cffi-1.14.6" && /opt/local/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 setup.py --no-user-cfg build -j12 :info:build Traceback (most recent call last): :info:build File "setup.py", line 154, in <module> :info:build from setuptools import setup, Distribution, Extension :info:build File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/init.py", line 18, in <module> :info:build from setuptools.dist import Distribution :info:build File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/dist.py", line 38, in <module> :info:build from setuptools import windows_support :info:build File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/windows_support.py", line 2, in <module> :info:build import ctypes :info:build File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ctypes/init.py", line 7, in <module> :info:build from _ctypes import Union, Structure, Array :info:build ImportError: dlopen(/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload/_ctypes.cpython-36m-darwin.so, 2): Library not loaded: /opt/local/lib/libffi.7.dylib :info:build Referenced from: /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload/_ctypes.cpython-36m-darwin.so :info:build Reason: image not found :info:build Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-cffi/py36-cffi/work/cffi-1.14.6" && /opt/local/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 setup.py --no-user-cfg build -j12