+// -->
+// MingW32 x86 4.8.1 uses wsacmsghdr, MingW x86_x64 uses _WSACMSGHDR and Visual Studio 2015 RC (ws2def.h) defines:
+// #if(_WIN32_WINNT >= 0x0600)
+// #define _WSACMSGHDR cmsghdr
+// #endif //(_WIN32_WINNT>=0x0600)
+// typedef struct _WSACMSGHDR {
+// SIZE_T cmsg_len;
+// INT cmsg_level;
+// INT cmsg_type;
+// /* followed by UCHAR cmsg_data[] */
+// } WSACMSGHDR, *PWSACMSGHDR, FAR *LPWSACMSGHDR;