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如何为scala安装antlib.xml以使ant工作？

现在,当我ant在包含scala任务的build.xml文件上运行时遇到以下错误.

[taskdef] Could not load definitions from resource scala/tools/ant/antlib.xml. It could not be found.
/scalala/scalala-read-only/scalala/build.xml:36: Problem: failed to create task or type scalac 

Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.

我已经解开了,scala-2.8.1.final/lib/scala-compiler.jar但我不知道在哪里放内容.

以下是build.xml中相应的ant代码片段:

  <target name="compile" depends="">
    <mkdir dir="${build.dir}"/>

    <scalac srcdir="${src.dir}" destdir="${build.dir}"
            classpathref="project.classpath" force="changed">
            <!-- addparams="-Yclosure-elim -optimise" -->
      <include name="**/*.scala"/>
    </scalac>
  </target>

回答

以下代码在build.xml文件中很重要:

  <!-- Define project …