Pip install fails for latest sdk commits on python 3.5.x

if i run: env/bin/pip install git+https://github.com/couchbase/couchbase-python-client.git --no-cache-dir it fails with the following:

TypeError: invalid file: PosixPath('/private/var/folders/fk/vw8mzrjn60j6n0d0kyzsrhz5tbgj2l/T/pip-req-build-6e46q184/cbuild_cfg.json')

This is a known issue with pathlib and python 3.5.x: https://stackoverflow.com/questions/42694112/when-using-pathlib-getting-error-typeerror-invalid-file-posixpathexample-t