FS-4645 does this help

src/switch_core.c

@@ -201,7 +201,7 @@ SWITCH_DECLARE(void) switch_core_screen_size(int *x, int *y)
 		if (y) *y = csbi.dwSize.Y;
 	}
 
-#elif TIOCGWINSZ
+#elif defined(TIOCGWINSZ)
 	struct winsize w;
 	ioctl(0, TIOCGWINSZ, &w);