diff -Naur grpc-1.40.0-original/setup.py grpc-1.40.0/setup.py

--- grpc-1.40.0-original/setup.py	2021-09-03 19:20:52.000000000 -0400

+++ grpc-1.40.0/setup.py	2021-09-07 14:57:55.247990450 -0400

@@ -29,6 +29,7 @@

 from distutils import util

 import os

 import os.path

+import pathlib

 import platform

 import re

 import shlex

@@ -154,6 +155,11 @@

 # runtime, the shared library must be installed

 BUILD_WITH_SYSTEM_RE2 = _env_bool_value('GRPC_PYTHON_BUILD_SYSTEM_RE2', 'False')

+# Export this variable to use the system installation of abseil. You need to

+# have the header files installed (in /usr/include/absl) and during

+# runtime, the shared library must be installed

+BUILD_WITH_SYSTEM_ABSL = os.environ.get('GRPC_PYTHON_BUILD_SYSTEM_ABSL', False)

+

 # Export this variable to force building the python extension with a statically linked libstdc++.

 # At least on linux, this is normally not needed as we can build manylinux-compatible wheels on linux just fine

 # without statically linking libstdc++ (which leads to a slight increase in the wheel size).

@@ -296,6 +302,10 @@

     CORE_C_FILES = filter(lambda x: 'third_party/re2' not in x, CORE_C_FILES)

     RE2_INCLUDE = (os.path.join('/usr', 'include', 're2'),)

+if BUILD_WITH_SYSTEM_ABSL:

+    CORE_C_FILES = filter(lambda x: 'third_party/abseil-cpp' not in x, CORE_C_FILES)

+    ABSL_INCLUDE = (os.path.join('/usr', 'include'),)

+

 EXTENSION_INCLUDE_DIRECTORIES = ((PYTHON_STEM,) + CORE_INCLUDE + ABSL_INCLUDE +

                                  ADDRESS_SORTING_INCLUDE + CARES_INCLUDE +

                                  RE2_INCLUDE + SSL_INCLUDE + UPB_INCLUDE +

@@ -325,6 +335,10 @@

     EXTENSION_LIBRARIES += ('cares',)

 if BUILD_WITH_SYSTEM_RE2:

     EXTENSION_LIBRARIES += ('re2',)

+if BUILD_WITH_SYSTEM_ABSL:

+    EXTENSION_LIBRARIES += tuple(

+        lib.stem[3:] for lib in pathlib.Path('/usr').glob('lib*/libabsl_*.so')

+    )

 DEFINE_MACROS = (('_WIN32_WINNT', 0x600),)

 asm_files = []