Python Monary Unable to find cmonary shared library libcmonary.so

Monary provides a Python interface for fast column queries from MongoDB. I set-up on Arch Linux as follows :

 $ pacman -S libmongoc python-numpy
 $ pip install pkgconfig
 $ pip install monary

Running the Monary package produces the following error :

RuntimeError: ('Unable to find cmonary shared library: ', 'libcmonary.so')

With some research I found this is an open issue with Monary.
To work around the issue open :

$ sudo vim /usr/lib/python3.5/site-packages/monary/monary.py

And update around line 68 to :

else:
    cmonary_fname = "libcmonary.cpython-35m-x86_64-linux-gnu.so"

I also found errors with the WriteConcern import which as a workaround in the monary.py file I updated to :

sys.path.append('/usr/lib/python3.5/site-packages/monary')
from write_concern import WriteConcern