From 04a85a1d385fb94ef076764c926a8c0006eff19f Mon Sep 17 00:00:00 2001
From: sourceturner <186975065+sourceturner@users.noreply.github.com>
Date: Sat, 6 Jun 2026 17:23:49 +0200
Subject: [PATCH] asyn-thrdd: add IPv6 guards

It seems that the usual '#ifdef USE_IPV6' guards have been overlooked in
lib/asyn-thrdd.c.

This commit makes sure that the code compiles if IPv6 is not available.

Closes #21881
---
 lib/asyn-thrdd.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/asyn-thrdd.c b/lib/asyn-thrdd.c
index 9ce41b20d0..c64f876830 100644
--- a/lib/asyn-thrdd.c
+++ b/lib/asyn-thrdd.c
@@ -481,8 +481,13 @@ static void async_thrdd_report_item(struct Curl_easy *data,
   struct dynbuf tmp;
   const char *sep = "";
   const struct Curl_addrinfo *ai = item->res;
-  int ai_family = (item->dns_queries & CURL_DNSQ_AAAA) ? AF_INET6 : AF_INET;
   CURLcode result;
+  int ai_family;
+#ifdef USE_IPV6
+  ai_family = (item->dns_queries & CURL_DNSQ_AAAA) ? AF_INET6 : AF_INET;
+#else
+  ai_family = AF_INET;
+#endif
 
   if(!CURL_TRC_DNS_is_verbose(data))
     return;
@@ -792,10 +797,12 @@ const struct Curl_addrinfo *Curl_async_get_ai(struct Curl_easy *data,
     if(thrdd->res_A)
       return async_thrdd_get_ai(thrdd->res_A->res, ai_family, index);
     break;
+#ifdef USE_IPV6
   case AF_INET6:
     if(thrdd->res_AAAA)
       return async_thrdd_get_ai(thrdd->res_AAAA->res, ai_family, index);
     break;
+#endif
   default:
     break;
   }