$OpenBSD: patch-deps_cares_include_ares_h,v 1.2 2017/06/27 12:04:08 abieber Exp $
Index: deps/cares/include/ares.h
--- deps/cares/include/ares.h.orig
+++ deps/cares/include/ares.h
@@ -31,6 +31,7 @@
 #  define WIN32
 #endif
 
+#include <sys/select.h> /* fd_set */
 #include <sys/types.h>
 
 /* HP-UX systems version 9, 10 and 11 lack sys/select.h and so does oldish
