+ /venv/bin/pip install -q --no-cache-dir -e /src/
Exception:
Traceback (most recent call last):
  File "/venv/lib/python3.5/site-packages/pip/_internal/cli/base_command.py", line 176, in main
    status = self.run(options, args)
  File "/venv/lib/python3.5/site-packages/pip/_internal/commands/install.py", line 346, in run
    session=session, autobuilding=True
  File "/venv/lib/python3.5/site-packages/pip/_internal/wheel.py", line 848, in build
    assert building_is_possible
AssertionError