From cf2e6f4b4285fd37f3a18b0b59a1338893ed8330 Mon Sep 17 00:00:00 2001
From: Lars Wendler <polynomial-c@gmx.de>
Date: Fri, 20 Mar 2026 10:37:08 +0100
Subject: [PATCH 1/2] configure.ac: Improve ipv6 option handling

---
 configure.ac | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4ff2094..7519129 100644
--- a/configure.ac
+++ b/configure.ac
@@ -66,13 +66,12 @@ AC_CHECK_FUNCS([memset select strchr strdup strrchr strstr])
 
 OPTFLAGS=''
 
-AC_ARG_ENABLE(ipv6,
-	AS_HELP_STRING([--disable-ipv6], [Enable IPv6 support @<:@default=yes@:>@]),
-	[ if test "$enableval" = "no" ; then enable_ipv6=no ; else enable_ipv6=yes ; fi ],
+AC_ARG_ENABLE([ipv6],
+	[AS_HELP_STRING([--disable-ipv6], [Enable IPv6 support @<:@default=yes@:>@])],
+	[ enable_ipv6="$enableval" ],
 	[ enable_ipv6=yes ])
-if test "$enable_ipv6" = "yes" ; then
-	AC_SUBST(OPTFLAGS, ["$OPTFLAGS -DUSE_IPV6=1"])
-fi
+AS_IF([test "$enable_ipv6" != "no"],
+	[AC_SUBST(OPTFLAGS, ["$OPTFLAGS -DUSE_IPV6=1"])])
 
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
-- 
2.53.0


From 2eaee63568e1a48e60035d33c7fb69788c99f220 Mon Sep 17 00:00:00 2001
From: Lars Wendler <polynomial-c@gmx.de>
Date: Fri, 20 Mar 2026 10:43:55 +0100
Subject: [PATCH 2/2] Fix build with --disable-ipv6

  dnstop.c:(.text.startup+0x4d0): undefined reference to `inXaddr_assign_v6'
---
 dnstop.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dnstop.c b/dnstop.c
index e6c9668..5b236a7 100644
--- a/dnstop.c
+++ b/dnstop.c
@@ -2036,7 +2036,9 @@ main(int argc, char *argv[])
 	    x.s6_addr[i/8] <<= 1;
 	    x.s6_addr[i/8] += i < opt_v6_agg ? 1 : 0;
 	}
+#if USE_IPV6
 	inXaddr_assign_v6(&v6mask, &x);
+#endif
     }
 
     if (0 == stat(device, &sb))
-- 
2.53.0