From d8e181925123ab1fd3dfcad3b29325b2b0ff704b Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Wed, 20 Oct 2021 10:14:59 -0700
Subject: [PATCH] bpo-41374: Remove obsolete exclusion of netinet/tcp.h on
 Cygwin (GH-21649)

---
 .../next/Library/2020-07-27-19-21-05.bpo-41374.cd-kFL.rst     | 2 ++
 Modules/socketmodule.h                                        | 4 +---
 2 files changed, 3 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2020-07-27-19-21-05.bpo-41374.cd-kFL.rst

diff --git a/Misc/NEWS.d/next/Library/2020-07-27-19-21-05.bpo-41374.cd-kFL.rst b/Misc/NEWS.d/next/Library/2020-07-27-19-21-05.bpo-41374.cd-kFL.rst
new file mode 100644
index 00000000000..a5b2e042a3f
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-07-27-19-21-05.bpo-41374.cd-kFL.rst
@@ -0,0 +1,2 @@
+Ensure that ``socket.TCP_*`` constants are exposed on Cygwin 3.1.6 and
+greater.
diff --git a/Modules/socketmodule.h b/Modules/socketmodule.h
index e4f375d5e81..aea599f0ee6 100644
--- a/Modules/socketmodule.h
+++ b/Modules/socketmodule.h
@@ -8,9 +8,7 @@
 #   include <sys/socket.h>
 # endif
 # include <netinet/in.h>
-# if !defined(__CYGWIN__)
-#  include <netinet/tcp.h>
-# endif
+# include <netinet/tcp.h>
 
 #else /* MS_WINDOWS */
 # include <winsock2.h>