releng.wtpbuilder/scripts/build/checkSystemPrereq.xml

<?xml version="1.0" encoding="UTF-8"?>
<project
    name="checkSystemPrereq"
    default="checkSystemPrereq"
    basedir=".">

    <fail
        unless="commandName"
        message="Must provide the commandName to run"/>
    <fail
        unless="arguments"
        message="Must provide the command arguments to run"/>

    <target name="checkSystemPrereq">

        <exec
            executable="${commandName}"
            resultproperty="returnCode"
            errorproperty="errorCode"
            outputproperty="output"
        	failifexecutionfails="false" 
            failonerror="false">
            <arg line="${arguments}"/>
        </exec>

        <fail unless="returnCode" message="**** Build failled: cannot execute ${commandName} ****"/>
    </target>
</project>