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-rw-r--r--Modules/socketmodule.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/Modules/socketmodule.h b/Modules/socketmodule.h
index b83f9af..4b6a10e 100644
--- a/Modules/socketmodule.h
+++ b/Modules/socketmodule.h
@@ -14,6 +14,13 @@
#else /* MS_WINDOWS */
# include <winsock2.h>
+/* Windows 'supports' CMSG_LEN, but does not follow the POSIX standard
+ * interface at all, so there is no point including the code that
+ * attempts to use it.
+ */
+# ifdef PySocket_BUILDING_SOCKET
+# undef CMSG_LEN
+# endif
# include <ws2tcpip.h>
/* VC6 is shipped with old platform headers, and does not have MSTcpIP.h
* Separate SDKs have all the functions we want, but older ones don't have