build-contrib.xml的核心配置如下：只有一个地方，notepad++，定位截图如下：
<property value="on"/>
下面是MANIFEST.MF里面的内容
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: MapReduce Tools for Eclipse
Bundle-SymbolicName: org.apache.Hadoop.eclipse;singleton:=true
Bundle-Version: 0.18
Bundle-Activator: org.apache.hadoop.eclipse.Activator
Bundle-Localization: plugin
Require-Bundle: org.eclipse.ui,
org.eclipse.core.runtime,
org.eclipse.jdt.launching,
org.eclipse.debug.core,
org.eclipse.jdt,
org.eclipse.jdt.core,
org.eclipse.core.resources,
org.eclipse.ui.ide,
org.eclipse.jdt.ui,
org.eclipse.debug.ui,
org.eclipse.jdt.debug.ui,
org.eclipse.core.expressions,
org.eclipse.ui.cheatsheets,
org.eclipse.ui.console,
org.eclipse.ui.navigator,
org.eclipse.core.filesystem,
org.apache.commons.logging
Eclipse-LazyStart: true
Bundle-ClassPath: classes/,lib/commons-cli.jar,lib/commons-httpclient.jar,lib/hadoop-core.jar,lib/jackson-mapper-asl.jar,lib/commons-configuration.jar,lib/commons-lang.jar,lib/jackson-core-asl.jar
Bundle-Vendor: Apache Hadoop
至此，已经ant编译完毕，截图如下
启动eclipse后，截图如下：
至此，插件已经完美生成，并运行