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

--- ortools/python/setup.py.in.orig	2021-10-01 03:13:58 UTC
+++ ortools/python/setup.py.in
@@ -42,8 +42,8 @@ setup(
     version='@PROJECT_VERSION@',
     packages=find_packages(),
     install_requires=[
-        'protobuf >= 3.18.0',
-        'absl-py >= 0.13',
+        #'protobuf >= 3.18.0',
+        #'absl-py >= 0.13',
     ],
     package_data={
         '@PROJECT_NAME@':[$<$<STREQUAL:$<TARGET_PROPERTY:@PYTHON_PROJECT@,TYPE>,SHARED_LIBRARY>:'.libs/*', '../$<TARGET_SONAME_FILE_NAME:@PYTHON_PROJECT@>'>],