From 5f87915d4af724f375b00dde2b948468d3e4ca97 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Mon, 26 Apr 2021 15:13:34 +0200
Subject: bpo-43466: Link with libz in PY_UNSUPPORTED_OPENSSL_BUILD path
 (GH-25587)

Some OpenSSL build flavors need libz for compression support.
---
 setup.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index 27e5f39..ca0ed83 100644
--- a/setup.py
+++ b/setup.py
@@ -2466,7 +2466,8 @@ class PyBuildExt(build_ext):
                 extra_linker_args.append(f"-Wl,--exclude-libs,lib{lib}.a")
             openssl_extension_kwargs["extra_link_args"] = extra_linker_args
             # don't link OpenSSL shared libraries.
-            openssl_extension_kwargs["libraries"] = []
+            # include libz for OpenSSL build flavors with compression support
+            openssl_extension_kwargs["libraries"] = ["z"]
 
         self.add(
             Extension(
-- 
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