https://bugs.gentoo.org/700108

--- sendmail-8.15.2-r1/libmilter/sm_gethost.c.orig	2014-03-04 19:59:45.000000000 -0500
+++ sendmail-8.15.2-r1/libmilter/sm_gethost.c	2019-11-15 09:32:25.812406080 -0500
@@ -51,18 +51,21 @@
 {
 	bool resv6 = true;
 	struct hostent *h;
-
+#ifdef RES_USE_INET6
 	if (family == AF_INET6)
 	{
 		/* From RFC2133, section 6.1 */
 		resv6 = bitset(RES_USE_INET6, _res.options);
 		_res.options |= RES_USE_INET6;
 	}
+#endif
 	SM_SET_H_ERRNO(0);
 	h = gethostbyname(name);
+#ifdef RES_USE_INET6
 	if (family == AF_INET6 && !resv6)
 		_res.options &= ~RES_USE_INET6;
 
+#endif
 	/* the function is supposed to return only the requested family */
 	if (h != NULL && h->h_addrtype != family)
 	{
--- sendmail-8.15.2-r2/sendmail/conf.c.orig	2019-11-14 17:36:41.262218822 -0500
+++ sendmail-8.15.2-r2/sendmail/conf.c	2019-11-15 09:57:43.550284580 -0500
@@ -4243,18 +4243,21 @@
 
 # else /* HAS_GETHOSTBYNAME2 */
 	bool resv6 = true;
-
+#ifdef RES_USE_INET6
 	if (family == AF_INET6)
 	{
 		/* From RFC2133, section 6.1 */
 		resv6 = bitset(RES_USE_INET6, _res.options);
 		_res.options |= RES_USE_INET6;
 	}
+#endif
 	SM_SET_H_ERRNO(0);
 	h = gethostbyname(name);
+#ifdef RES_USE_INET6
 	if (!resv6)
 		_res.options &= ~RES_USE_INET6;
 
+#endif
 	/* the function is supposed to return only the requested family */
 	if (h != NULL && h->h_addrtype != family)
 	{