可能重复：
Ivy 无法解决依赖关系，无法找到原因
我正在尝试运行以下构建任务（initIvy）：
<?xml version="1.0" encoding="UTF-8"?>
<project name="myproject-build" default="package" basedir=".." xmlns:ivy="antlib:org.apache.ivy.ant">
<property file="build/build.properties"/>
<property environment="env"/>
<!-- Ant library path, including all of its plugins. -->
<path id="ant.lib.path">
<fileset dir="${env.ANT_HOME}/lib" includes="*.jar"/>
</path>
<!-- CONFIGURE IVY -->
<taskdef resource="org/apache/ivy/ant/antlib.xml"
uri="antlib:org.apache.ivy.ant" classpathref="ant.lib.path"/>
<!-- Use Ivy tasks to resolve dependencies into the local Ivy cache. -->
<target name="initIvy">
<!-- Initialize Ivy and connect to host repository. -->
<echo message="Initializing Apache Ivy and connecting to the host repository."/>
<ivy:settings url="${ivy.std.repo.settings.url}" realm="${ivy.std.repo.realm}" username="${ivy.std.repo.username}" passwd="${ivy.std.repo.password}"/>
<!-- Clear/flush the Ivy cache. -->
<echo message="Cleaning the local Ivy cache for the current build."/>
<ivy:cleancache/>
</target>
<!-- Rest of buildfile omitted for brevity. -->
</project>
当我运行时，ant -buildfile build.xml initIvy我得到以下输出：
Buildfile: /<path-to-my-project>/build/build.xml
[taskdef] Could not load definitions from resource org/apache/ivy/ant/antlib.xml. It could not be found.
initIvy:
[echo] Initializing Apache Ivy and connecting to the host repository.
BUILD FAILED
/<path-to-my-project>/build/build.xml:81: Problem: failed to create task or type antlib:org.apache.ivy.ant:settings
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.
No types or tasks have been defined in this namespace yet
This appears to be an antlib declaration.
Action: Check that the implementing library exists in one of:
-/<path-to-my-ANT_HOME>/lib
-/home/myUser/.ant/lib
-a directory added on the command line with the -lib argument
当我转到 ${ANT_HOME}/lib 时，我看不到任何标有“antlib*.jar”的 JAR。
所以我猜我下载了一个不包含 Antlib 的 Ant 版本，而现在我使用的是 Ivy（它使用 Antlib），构建过程是否令人窒息？
如果这是一个 Antlib 问题，那么我相信我想要一个可用的发行版here。如果是这样，有人可以确认我应该使用哪一个（仅包含 Antlib 而没有其他任何内容），并确认安装它的过程；即，是否就像将正确的 JAR 放入 ${ANT_HOME}/lib 一样简单？等等。
如果这是常春藤问题，那么有人可以为我指出正确的方向吗？
如果这既不是 Antlib 也不是 Ivy，同上上面的问题。提前致谢！