Reset transient resolver failures in glibc
https://github.com/openntpd-portable/openntpd-portable/issues/12

--- src/config.c.orig	2015-08-24 16:29:04.396307991 +0200
+++ src/config.c	2015-08-24 16:29:27.791193789 +0200
@@ -23,6 +23,7 @@
 #include <netinet/in.h>
 
 #include <errno.h>
+#include <resolv.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -132,6 +133,9 @@
 	struct sockaddr_in6	*sa_in6;
 	struct ntp_addr		*h, *hh = NULL;
 
+#ifdef __GLIBC__
+	res_init();
+#endif
 	bzero(&hints, sizeof(hints));
 	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */