python setup.py build
Traceback (most recent call last):
File "/home/jose/tmp/python-quamash-git/src/quamash/setup.py", line 2, in <module>
import quamash
File "/home/jose/tmp/python-quamash-git/src/quamash/quamash/__init__.py", line 594, in <module>
from ._unix import _SelectorEventLoop
File "/home/jose/tmp/python-quamash-git/src/quamash/quamash/_unix.py", line 44, in <module>
class _SelectorMapping(collections.Mapping):
AttributeError: module 'collections' has no attribute 'Mapping'