from setuptools import setup
setup(name='mypkg', version='0.0.1', description='Foo', author='bar',
    author_email='bar@example.com', install_requires=['pyScss==1.1.3'],
    dependency_links=[
    'https://github.com/nadavshatz/pyScss/zipball/master#egg=pyScss-1.1.3'])
How can I make setuptools install a package from another source that's also available on pypi with the same version number?