This fixes:
pythonCatchConflictsPhase
Found duplicated packages in closure for dependency 'lmdb':
lmdb 0.97 (/build/lmdb-0.97)
lmdb 0.97 (/nix/store/js0iimri6y9yqgfc111jzp3mrv5ic9cj-python3.7-lmdb-0.97/lib/python3.7/site-packages)
Package duplicates found in closure, see above. Usually this happens if two packages depend on different version of the same dependency.
builder for '/nix/store/9bcn2m3r5v8slmpj31hxw05j906qgl5l-python3.7-lmdb-0.97.drv' failed with exit code 1
This was probably broken by f7e28bf5d8
39d0c9693e