Arch Linux

Description:
borgbackup fails after update to 1.1.5 and latest python-msgpack
with the following output:

[tmb@notebook ~]$ borg
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 574, in _build_master
ws.require(__requires__)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 892, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 783, in resolve
raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (msgpack 0.5.6 (/usr/lib/python3.6/site-packages), Requirement.parse('msgpack<0.5.0,>=0.4.6'), {'borgbackup'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/bin/borg", line 6, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3088, in <module>
@_call_aside
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3072, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3101, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 576, in _build_master
return cls._build_from_requirements(__requires__)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 589, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 778, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'msgpack<0.5.0,>=0.4.6' distribution was not found and is required by borgbackup


Additional info:
* borg 1.1.5
* python-msgpack 0.6.6-1


Steps to reproduce:
$ pacman -Syu
$ borg list