#if defined(HAVE_NETDB_H)
#include <netdb.h>
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
typedef void* optval_t;
// ntohs() on FreeBSD may require both netinet/in.h and arpa/inet.h, in order