traceback

==> /usr/local/Cellar/cumulusci/2.3.1/libexec/bin/pip install -v --no-deps --no-binary :all:
Last 15 lines from /Users/jestevez/Library/Logs/Homebrew/cumulusci/03.pip:
Created temporary directory: /private/tmp/pip-install-x0az8f64
Cleaning up...
Removed build tracker '/private/tmp/pip-req-tracker-71aqe9lu'
Directory '/private/tmp/cumulusci--entrypoints-20190215-57167-ft6f23' is not installable. Neither 'setup.py' nor 'pyproject.toml' found.
Exception information:
Traceback (most recent call last):
  File "/usr/local/Cellar/cumulusci/2.3.1/libexec/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 179, in main
    status = self.run(options, args)
  File "/usr/local/Cellar/cumulusci/2.3.1/libexec/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 289, in run
    self.name, wheel_cache
  File "/usr/local/Cellar/cumulusci/2.3.1/libexec/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 269, in populate_requirement_set
    wheel_cache=wheel_cache
  File "/usr/local/Cellar/cumulusci/2.3.1/libexec/lib/python3.7/site-packages/pip/_internal/req/constructors.py", line 248, in install_req_from_line
    "nor 'pyproject.toml' found." % name
pip._internal.exceptions.InstallationError: Directory '/private/tmp/cumulusci--entrypoints-20190215-57167-ft6f23' is not installable. Neither 'setup.py' nor 'pyproject.toml' found.