Marc-Andre Lemburg has found the culprit of the problem in r57142.

b5daaed3 · Christian Heimes · f77c929c · b5daaed3
Commit b5daaed3 authored Nov 30, 2007 by Christian Heimes
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Modules/socketmodule.h Modules/socketmodule.h +1 -1

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--- a/Modules/socketmodule.h
+++ b/Modules/socketmodule.h
@@ -8,7 +8,7 @@
 #   include <sys/socket.h>
 # endif
 # include <netinet/in.h>
-# if defined(__CYGWIN__) || (defined(PYOS_OS2) && defined(PYCC_VACPP))
+# if !(defined(__CYGWIN__) || (defined(PYOS_OS2) && defined(PYCC_VACPP)))
 #  include <netinet/tcp.h>
 # endif