[Python] How can I use git repos as dependencies for my PyPi package?

I have a package which I'm pushing to PyPi and some of the depedencies are not packages, but installable git repositories. My requirements.txt looks like this

sphinx_bootstrap_theme>=0.6.5
matplotlib>=2.2.0
numpy>=1.15.0
sphinx>=1.7.5
sphinx-argparse>=0.2.2
tensorboardX
tqdm>=4.24.0
Cython>=0.28.5

# git repos
git+git://github.com/themightyoarfish/svcca-gpu.git


Accordingly, my setup.py has this content:

#!/usr/bin/env python

from distutils.core import setup
import setuptools
import os

with open('requirements.txt', mode='r') as f:
requirements = f.read()
required_pkgs, required_repos = requirements.split('# git repos')
required_pkgs = required_pkgs.split()
required_repos = required_repos.split()

with open('README.md') as f:
readme = f.read()

setup(name=...
...
packages=setuptools.find_packages('.', include=[...]),
install_requires=required_pkgs,
dependency_links=required_repos,
zip_safe=False, # don't install egg, but source
)


But running pip install <package> does not actually install the git dependency. I assume that pip doesn't actually use the setup script. It works when I run python setup.py install manually.

Edit:

I also tried removing dependency_links and just using install_requires with the repository, but when installing my repository from GitHub (the project including the above files), I'm met with

Complete output from command python setup.py egg_info:
error in ikkuna setup command: 'install_requires' must be a string or
list of strings containing valid project/version requirement specifiers; Invalid requirement, parse error at "'+git://g'"


It has been suggested in other answers that one can put something like

git+https://github.com/themightyoarfish/svcca-gpu.git#egg=svcca


into requirements.txt, but that fails with

error in <pkg> setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers; Invalid requirement, parse error at "'+https:/'


Question: (How) Can I list git repositories as dependencies for a pip package?

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