Gradle-从Eclipse项目构建路径中排除包

在使用Gradle为Eclipse构建项目时，如何从构建路径中排除包？

文档中介绍了一些示例：

eclipse {

  //if you want parts of paths in resulting file to be replaced by variables (files):
  pathVariables 'GRADLE_HOME': file('/best/software/gradle'), 'TOMCAT_HOME': file('../tomcat')

  classpath {
    //you can tweak the classpath of the eclipse project by adding extra configurations:
    plusConfigurations += configurations.provided

    //you can also remove configurations from the classpath:
    minusConfigurations += configurations.someBoringConfig

    //if you don't want some classpath entries 'exported' in eclipse
    noExportConfigurations += configurations.provided

    //if you want to append extra containers:
    containers 'someFriendlyContainer', 'andYetAnotherContainer'

    //customizing the classes output directory:
    defaultOutputDir = file('build-eclipse')

    //default settings for dependencies sources/javadoc download:
    downloadSources = true
    downloadJavadoc = false
  }
}