diff --git a/nbase/configure b/nbase/configure
index 0bc5792f7..d5e5dfe1f 100755
--- a/nbase/configure
+++ b/nbase/configure
@@ -4519,20 +4519,71 @@ if test "$ac_res" != no; then :
 
 fi
 
-for ac_func in gai_strerror
+for ac_func in gai_strerror inet_pton inet_ntop
 do :
-  ac_fn_c_check_func "$LINENO" "gai_strerror" "ac_cv_func_gai_strerror"
-if test "x$ac_cv_func_gai_strerror" = xyes; then :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
   cat >>confdefs.h <<_ACEOF
-#define HAVE_GAI_STRERROR 1
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
 _ACEOF
 
 fi
 done
 
-ac_fn_c_check_func "$LINENO" "inet_ntop" "ac_cv_func_inet_ntop"
-if test "x$ac_cv_func_inet_ntop" = xyes; then :
-  $as_echo "#define HAVE_INET_NTOP 1" >>confdefs.h
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing inet_ntop" >&5
+$as_echo_n "checking for library containing inet_ntop... " >&6; }
+if ${ac_cv_search_inet_ntop+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char inet_ntop ();
+int
+main ()
+{
+return inet_ntop ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' nsl resolv network; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_inet_ntop=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_inet_ntop+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_inet_ntop+:} false; then :
+
+else
+  ac_cv_search_inet_ntop=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_inet_ntop" >&5
+$as_echo "$ac_cv_search_inet_ntop" >&6; }
+ac_res=$ac_cv_search_inet_ntop
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 else
   case " $LIBOBJS " in
@@ -4541,11 +4592,62 @@ else
  ;;
 esac
 
+
 fi
 
-ac_fn_c_check_func "$LINENO" "inet_pton" "ac_cv_func_inet_pton"
-if test "x$ac_cv_func_inet_pton" = xyes; then :
-  $as_echo "#define HAVE_INET_PTON 1" >>confdefs.h
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing inet_pton" >&5
+$as_echo_n "checking for library containing inet_pton... " >&6; }
+if ${ac_cv_search_inet_pton+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char inet_pton ();
+int
+main ()
+{
+return inet_pton ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' nsl resolv network; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_inet_pton=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_inet_pton+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_inet_pton+:} false; then :
+
+else
+  ac_cv_search_inet_pton=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_inet_pton" >&5
+$as_echo "$ac_cv_search_inet_pton" >&6; }
+ac_res=$ac_cv_search_inet_pton
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 else
   case " $LIBOBJS " in
@@ -4554,8 +4656,8 @@ else
  ;;
 esac
 
-fi
 
+fi
 
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working getaddrinfo" >&5
diff --git a/nbase/configure.ac b/nbase/configure.ac
index eb28fa483..6af2dca2a 100644
--- a/nbase/configure.ac
+++ b/nbase/configure.ac
@@ -185,8 +185,13 @@ AC_ARG_ENABLE(ipv6,
 AC_SEARCH_LIBS(getaddrinfo, [inet6 socket])
 AC_SEARCH_LIBS(gai_strerror, [inet6 socket])
 AC_SEARCH_LIBS(getnameinfo, [inet6 socket])
-AC_CHECK_FUNCS(gai_strerror)
-AC_REPLACE_FUNCS(inet_ntop inet_pton)
+AC_CHECK_FUNCS([gai_strerror inet_pton inet_ntop])
+AC_SEARCH_LIBS(inet_ntop, [nsl resolv network], [],
+               [AC_LIBOBJ(inet_ntop)
+               ])
+AC_SEARCH_LIBS(inet_pton, [nsl resolv network], [],
+               [AC_LIBOBJ(inet_pton)
+               ])
 APR_CHECK_WORKING_GETADDRINFO
 # The inet_addr function is used by APR_CHECK_WORKING_GETNAMEINFO.
 AC_SEARCH_LIBS(inet_addr, [nsl])