add missing file from common/
diff --git a/prepare.xml b/prepare.xml
new file mode 100644
index 0000000..b3a64f4
--- /dev/null
+++ b/prepare.xml
@@ -0,0 +1,65 @@
+<?xml version="1.0"?>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+<!--
+Interim build-snippet.
+
+The original of this snippet is maintained in the antlib-common project.
+-->
+<project default="bootstrap" xmlns:unless="ant:unless" xmlns:if="ant:if">
+
+ <!-- Which released version of AntUnit to use, where to download, where to store. -->
+ <property name="antunit.version" value="1.3"/>
+ <property name="antunit.url" value="https://repo1.maven.org/maven2/org/apache/ant/ant-antunit/${antunit.version}/ant-antunit-${antunit.version}.jar"/>
+ <property name="antunit.file" value="ant-antunit.jar"/>
+
+ <!-- Skip unnecessary tasks. -->
+ <available property="antunit.present" file="${antunit.file}"/>
+
+ <target name="update-prepare-script">
+ <echo>updating prepare.xml</echo>
+ <copy file="common/prepare.xml" tofile="prepare.xml"/>
+ </target>
+
+ <target name="get-antunit" unless="antunit.present">
+ <echo>updating AntUnit</echo>
+ <get src="${antunit.url}" dest="${antunit.file}" usetimestamp="true"/>
+ </target>
+
+
+ <!-- Use a 'bootstrap-phase' so changes of the preparation could be catched in the same CI-cycle. -->
+ <target name="bootstrap"
+ depends="update-prepare-script"
+ description="Bootstraps the preparation script by updating this script from common."
+ >
+ <echo>Bootstrap done. Next step:</echo>
+ <echo> ant -f prepare.xml prepare</echo>
+ </target>
+
+ <target name="prepare"
+ depends="get-antunit"
+ description="Prepare the build by 'preparing' the infrastructure"
+ >
+ <echo>Preparation done. Next steps:</echo>
+ <echo> ant clean distribution</echo>
+ <echo> ant -lib ${antunit.file} -lib build/lib test</echo>
+ </target>
+
+</project>
