-diff -ur postfix-3.4.6.orig/src/dns/dns_str_resflags.c postfix-3.4.6/src/dns/dns_str_resflags.c
---- postfix-3.4.6.orig/src/dns/dns_str_resflags.c 2016-05-15 17:20:14.000000000 +0200
-+++ postfix-3.4.6/src/dns/dns_str_resflags.c 2019-09-05 22:01:00.522000000 +0200
-@@ -60,10 +60,16 @@
- "RES_DEFNAMES", RES_DEFNAMES,
- "RES_STAYOPEN", RES_STAYOPEN,
- "RES_DNSRCH", RES_DNSRCH,
-+#ifdef RES_INSECURE1
- "RES_INSECURE1", RES_INSECURE1,
-+#endif
-+#ifdef RES_INSECURE2
- "RES_INSECURE2", RES_INSECURE2,
-+#endif
- "RES_NOALIASES", RES_NOALIASES,
-+#ifdef RES_USE_INET6
- "RES_USE_INET6", RES_USE_INET6,
-+#endif
- #ifdef RES_ROTATE
- "RES_ROTATE", RES_ROTATE,
- #endif