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-rw-r--r--resolv/resolv.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/resolv/resolv.h b/resolv/resolv.h
index a0de320d0f..c6e695dc72 100644
--- a/resolv/resolv.h
+++ b/resolv/resolv.h
@@ -215,6 +215,7 @@ struct res_sym {
 #define RES_NOIP6DOTINT	0x00080000	/* Do not use .ip6.int in IPv6
 					   reverse lookup */
 #define RES_USE_EDNS0	0x00100000	/* Use EDNS0.  */
+#define RES_SNGLKUP	0x00200000	/* one outstanding request at a time */
 
 #define RES_DEFAULT	(RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)