https://github.com/etingof/pysnmp/commit/2ee8b8707d36e772d6308f434b445a766e6586e7
https://bugs.gentoo.org/836608

From 2ee8b8707d36e772d6308f434b445a766e6586e7 Mon Sep 17 00:00:00 2001
From: Michael Weiss <dev.primeos@gmail.com>
Date: Thu, 7 Nov 2019 18:55:45 +0100
Subject: [PATCH] Improve the setuptools version check (#322)

Handles malformed `setuptools.__version__` such as "41.4.0.post20191022"
--- a/setup.py
+++ b/setup.py
@@ -85,7 +85,7 @@ def howto_install_setuptools():
 
     setup, Command = setuptools.setup, setuptools.Command
 
-    observed_version = [int(x) for x in setuptools.__version__.split('.')]
+    observed_version = [int(x) for x in setuptools.__version__.split('.')[:3]]
     required_version = [36, 2, 0]
 
     # NOTE(etingof): require fresh setuptools to build proper wheels