Installation schlägt fehl wenn das Modul "requests" vorher nicht installiert ist

Collecting git+https://git.scc.kit.edu/zy8373/python-kitgvapi.git
  Cloning https://git.scc.kit.edu/zy8373/python-kitgvapi.git to /private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4/setup.py", line 16, in <module>
        version=package_meta('version'),
      File "/private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4/setup.py", line 7, in package_meta
        m = __import__('kitgvapi')
      File "/private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4/kitgvapi/__init__.py", line 15, in <module>
        from .object_interface import ObjectInterface
      File "/private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4/kitgvapi/object_interface.py", line 3, in <module>
        from .clients import RestClient
      File "/private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4/kitgvapi/clients.py", line 4, in <module>
        import requests
    ModuleNotFoundError: No module named 'requests'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/7b/w3bjk8tn7vvb3s080cr82lb8xghdf6/T/pip-req-build-p1_ftnv4/

Zu reproduzieren des Fehlers:

neues venv anlegen
pip install git+https://git.scc.kit.edu/zy8373/python-kitgvapi.git