diff -urN bind-8.2.5-T1A/src/port/cygwin/include/sys/un.h bind-8.2.5-T1A-cygwin/src/port/cygwin/include/sys/un.h
--- bind-8.2.5-T1A/src/port/cygwin/include/sys/un.h	Sun Apr  1 11:11:49 2001
+++ bind-8.2.5-T1A-cygwin/src/port/cygwin/include/sys/un.h	Wed Jul 25 02:32:52 2001
@@ -0,0 +1,6 @@
+#ifndef _cygwin_sys_un_h
+#define _cygwin_sys_un_h
+
+#include_next <sys/un.h>
+
+#endif