setup.py is not installing dependencies

Question

I have few dependencies which I am unable to install with PIP using setuptools. Here given below is the content from my setup.py file, in which I am unable to install cosign inside my package.

Note: There is no way to install cosign with pip

from setuptools import setup

setup(
    name='samplepackage',
    version='1.0',
    description='A useful module',
    author='XYZ',
    packages=['samplepackage'],  #same as name
    install_requires=['wheel',
                 'vault',
                 'cosign'],            
   package_data={'': ['*.yaml', '*.*']}
   ) 

How can I mention dependencies or wrap dependencies using setuptools inside my package which are not installing with PIP ?