+# if !defined(_WIN32_WCE) && !defined(_WIN32_WINNT)
+ /*
+ * Defining _WIN32_WINNT here in e_os.h implies certain "discipline."
+ * Most notably we ought to check for availability of each specific
+ * routine with GetProcAddress() and/or guard NT-specific calls with
+ * GetVersion() < 0x80000000. One can argue that in latter "or" case
+ * we ought to /DELAYLOAD some .DLLs in order to protect ourselves
+ * against run-time link errors. This doesn't seem to be necessary,
+ * because it turned out that already Windows 95, first non-NT Win32
+ * implementation, is equipped with at least NT 3.51 stubs, dummy
+ * routines with same name, but which do nothing. Meaning that it's
+ * apparently sufficient to guard "vanilla" NT calls with GetVersion
+ * alone, while NT 4.0 and above interfaces ought to be linked with
+ * GetProcAddress at run-time.
+ */
+# define _WIN32_WINNT 0x0400
+# endif
+# if !defined(OPENSSL_NO_SOCK) && defined(_WIN32_WINNT)
+ /*
+ * Just like defining _WIN32_WINNT including winsock2.h implies
+ * certain "discipline" for maintaining [broad] binary compatibility.
+ * As long as structures are invariant among Winsock versions,
+ * it's sufficient to check for specific Winsock2 API availability
+ * at run-time [DSO_global_lookup is recommended]...
+ */
+# include <winsock2.h>
+# include <ws2tcpip.h>
+ /* yes, they have to be #included prior to <windows.h> */
+# endif