pip
setuptools<50.0.0   # 50.0.0 might break pyinstaller. see https://github.com/pyinstaller/pyinstaller/commit/e9f9d79d6b23c767512156323d0a5d28c6386a57
wheel

# TODO test newer versions of pyinstaller for build-reproducibility.
#      upper bound is there due to change in code-signing behaviour
#      (https://github.com/pyinstaller/pyinstaller/pull/5581)
pyinstaller>=3.6,<4.3

# needed by pyinstaller:
macholib

# Note: hidapi requires Cython at build-time (not needed at runtime).
# For reproducible builds, the version of Cython must be pinned down.
# The pinned Cython must be installed before hidapi is built;
# otherwise when installing hidapi, pip just downloads the latest Cython.
# see https://github.com/spesmilo/electrum/issues/5859
Cython>=0.27