Installation error

[ppuertocrem]

Building an image from the following Dockerfile return

error in {} setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers; Unordered types are not allowed

FROM python:3
RUN git clone https://github.com/IntegrCiTy/obnl.git
RUN pip install --no-cache-dir -r obnl/requirements.txt
RUN cd obnl && python setup.py install

Same for python:2 base image and for develop branch (RUN git clone -b develop https://github.com/IntegrCiTy/obnl.git)

Works fine with python:3 and feature/connection-util branch

Docker version 17.12.0-ce, build c97c6d6