See https://github.com/google/or-tools/issues/2305

--- tools/setup.py.in.orig	2020-12-09 16:30:21 UTC
+++ tools/setup.py.in
@@ -42,8 +42,8 @@ setup(
     version='VVVV',
     packages=find_packages(),
     install_requires=[
-        'protobuf >= 3.14.0',
-        'absl-py >= 0.11',
+        #'protobuf >= 3.14.0',
+        #'absl-py >= 0.11',
     ],
     package_data={
         'ortools.constraint_solver' : ['_pywrapcp.dll', '*.pyi'],