writing top-level names to pip-egg-info/mercurial.egg-info/top_level.txt writing manifest file 'pip-egg-info/mercurial.egg-info/SOURCES.txt' Python headers are required to build Mercurial but weren't found in /usr/include/python3.7m/Python.h
---------------------------------------- Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-p4mwzd3g/Mercurial/ Running after_script Uploading artifacts for failed job ERROR: Job failed: exit code 1