https://github.com/symengine/symengine.py/commit/987e665e71cf92d1b021d7d573a1b9733408eecf
https://bugs.gentoo.org/836599

From: Isuru Fernando <isuruf@gmail.com>
Date: Sat, 2 Apr 2022 15:43:00 -0500
Subject: [PATCH] Fix for latest setuptools

--- a/setup.py
+++ b/setup.py
@@ -226,6 +226,7 @@ def finalize_options(self):
       url="https://github.com/symengine/symengine.py",
       python_requires='>=3.7,<4',
       zip_safe=False,
+      packages=['symengine'],
       cmdclass = cmdclass,
       classifiers=[
         'License :: OSI Approved :: MIT License',