Use prereq.sh for reclimit system test

bin/tests/system/Makefile.am

@@ -145,6 +145,7 @@ TESTS +=			\
 	padding			\
 	pending			\
 	pipelined		\
+	reclimit		\
 	redirect		\
 	resolver		\
 	rndc			\
@@ -184,14 +185,6 @@ TESTS +=			\
 	zero			\
 	zonechecks
 
-if HAVE_PERLMOD_NET_DNS
-
-if HAVE_PERLMOD_NET_DNS_NAMESERVER
-TESTS += reclimit
-endif HAVE_PERLMOD_NET_DNS_NAMESERVER
-
-endif HAVE_PERLMOD_NET_DNS
-
 if HAVE_PYMOD_DNS
 TESTS += qmin cookie
 if HAVE_PERLMOD_NET_DNS

bin/tests/system/reclimit/prereq.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0.  If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+. ../conf.sh
+
+if ! ${PERL} -MNet::DNS -e ''
+then
+	echo_i "perl Net::DNS module is required"
+	exit 1
+fi
+
+if ! ${PERL} -MNet::DNS::Nameserver -e ''
+then
+	echo_i "perl Net::DNS::Nameserver module is required"
+	exit 1
+fi
+
+exit 0