Error installing caput on top of 2019_01_py3/stable_base.sh

[fandinomat]

To reproduce, do on cedar:

source /project/rpp-krs/chime/chime_env/2019_01_py3/stable_base.sh
virtualenv --system-site-packages --python=python3 --prompt='(p3_chimeenv)' venv
source venv/bin/activate
pip install git+ssh://git@github.com/radiocosmology/caput#egg=caput

full traceback:

Ignoring pip: markers 'python_version < "3"' don't match your environment
Looking in links: /cvmfs/soft.computecanada.ca/custom/python/wheelhouse/avx2, /cvmfs /soft.computecanada.ca/custom/python/wheelhouse/generic
Collecting caput from git+ssh://git@github.com/radiocosmology/caput#egg=caput
Cloning ssh://git@github.com/radiocosmology/caput to /tmp/pip-install-ulbmu86d/caput
Running command git clone -q ssh://git@github.com/radiocosmology/caput /tmp/pip-install-ulbmu86d/caput
Installing build dependencies ... done
Getting requirements to build wheel ... done
ERROR: Exception:
Traceback (most recent call last):
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/cli/base_command.py", line 188, in main
status = self.run(options, args)
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/commands/install.py", line 345, in run
resolver.resolve(requirement_set)
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/legacy_resolve.py", line 196, in resolve
self._resolve_one(requirement_set, req)
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/legacy_resolve.py", line 359, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/legacy_resolve.py", line 307, in _get_abstract_dist_for
self.require_hashes
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/operations/prepare.py", line 215, in prepare_linked_requirement
finder, self.build_isolation,
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_internal/distributions/source.py", line 70, in prepare_distribution_metadata
reqs = self.req.pep517_backend.get_requires_for_build_wheel()
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_vendor/pep517/wrappers.py", line 71, in get_requires_for_build_wheel
'config_settings': config_settings
File "/home/fandino/virtualenvs/p3chimeenv/venv/lib/python3.5/site-packages/pip/_vendor/pep517/wrappers.py", line 162, in _call_hook
raise BackendUnavailable
pip._vendor.pep517.wrappers.BackendUnavailable```

@ketiltrout

[fandinomat]

Possibly related to this:

pypa/pip#6264

pypa/setuptools#1694

[jrs65]

@fandinomat if you want to install on cedar. I would base on top of 2019_09 which is a much more recent and thorough Python 3 install.