diff --git a/src/config.in b/src/config.in
index f705a915032..f3af96cf346 100644
--- a/src/config.in
+++ b/src/config.in
@@ -121,6 +121,7 @@ and this notice must be preserved on all copies.  */
 #undef HAVE_LOGB
 #undef HAVE_FREXP
 #undef HAVE_FTIME
+#undef HAVE_RES_INIT /* For -lresolv on Suns.  */
 
 #undef HAVE_AIX_SMT_EXP