diff --git a/bin/tests/system/ixfr/prereq.sh b/bin/tests/system/ixfr/prereq.sh
new file mode 100644
index 0000000000..9536aaf3c4
--- /dev/null
+++ b/bin/tests/system/ixfr/prereq.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+#
+# Copyright (C) 2000, 2001  Internet Software Consortium.
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
+# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
+# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+# FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+# $Id: prereq.sh,v 1.1 2001/05/14 22:35:57 gson Exp $
+
+if $PERL -e 'use Net::DNS;' 2>/dev/null
+then
+    :
+else
+    echo "I:This test requires the Net::DNS library." >&2
+    exit 1
+fi
diff --git a/util/copyrights b/util/copyrights
index f44408ddd6..26bee83860 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -439,6 +439,7 @@
 ./bin/tests/system/glue/yy.good			X	2000,2001
 ./bin/tests/system/ifconfig.sh			SH	2000,2001
 ./bin/tests/system/ixfr/clean.sh		SH	2001
+./bin/tests/system/ixfr/prereq.sh		SH	2001
 ./bin/tests/system/ixfr/setup.sh		SH	2001
 ./bin/tests/system/ixfr/tests.sh		SH	2001
 ./bin/tests/system/ixfr/ans2/.cvsignore		X	2001