#define _SGI_SOURCE 1
#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
-# if defined (_MSC_VER)
+# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
# define _WIN32_WINNT 0x0502
# endif
#define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */