--- a/src/lib/config-win32.h	(index)
+++ b/src/lib/config-win32.h	(working tree)
@@ -72,6 +72,12 @@
 #define HAVE_WS2TCPIP_H 1
 #endif
 
+/* Define to 1 if you have the <sys/uio.h> header file. */
+#define HAVE_SYS_UIO_H 1
+
+/* Define to 1 if you have the writev function. */
+#define HAVE_WRITEV 1
+
 /* ---------------------------------------------------------------- */
 /*                        OTHER HEADER INFO                         */
 /* ---------------------------------------------------------------- */