前提: 机器能联网

(1) 用SVN下载Mahout最新源码，check out http://svn.apache.org/repos/asf/mahout/trunk
    注: 发行版源码在 http://archive.apache.org/dist/mahout/ 下

(2) 下载 maven，这里下载二进制版本的 maven-3.0.3，在 http://archive.apache.org/dist/maven/binaries/ 中下载，下载完成后，解压 apache-maven-3.0.3-bin.tar.gz 即可

(3) 安装 JDK，配置环境变量 JAVA_HOME，maven要用到

(4) 测试 mvn
[root@glnode04 mahout-svn]# /local/apache-maven-3.0.3/bin/mvn
mvn       mvnDebug  mvnyjp   

(5) 编译 mahout

查看 mahout 源码
[zhankunlin@IctHTC ~]$ ls mahout-svn
bin         core          eclipse   install.log  math        pom.xml     src        utils
buildtools  distribution  examples  LICENSE.txt  NOTICE.txt  README.txt  taste-web

进入源码目录，运行以下命令进行编译安装

[root@glnode04 mahout-svn]# /local/apache-maven-3.0.3/bin/mvn install

maven将使用默认配置文件 pom.xml，编译 core、examples、eclipse、 taste-web、utils等目录下的所有源码并且进行打包，在编译过程中，会自动从网上下载相关依赖包，所以必须保证机器能联网，否则会在编译过程中出现如下错误。

[ERROR] Plugin org.apache.maven.plugins:maven-install-plugin:2.3.1 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-install-plugin:jar:2.3.1: Could not transfer artifact org.apache.maven.plugins:maven-install-plugin:pom:2.3.1 from/to central (http://repo1.maven.org/maven2): Error transferring file: repo1.maven.org: Unknown host repo1.maven.org -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException

编译完成后再查看相关目录，例如 core、examples、eclipse、 taste-web、utils等，都生成了相关包和文件，主要包含 target 目录。

[zhankunlin@IctHTC ~]$ ls mahout-svn/core/
build  input  output  pom.xml  src  target  testdata
[zhankunlin@IctHTC ~]$ ls mahout-svn/core/target/
antrun/                               mahout-core-0.5-SNAPSHOT.jar          maven-archiver/
archive-tmp/                          mahout-core-0.5-SNAPSHOT-job.jar      surefire-reports/
classes/                              mahout-core-0.5-SNAPSHOT-sources.jar  test-classes/
generated-sources/                    mahout-core-0.5-SNAPSHOT-tests.jar   
[zhankunlin@IctHTC ~]$ ls mahout-svn/core/target/
antrun       classes            mahout-core-0.5-SNAPSHOT.jar      mahout-core-0.5-SNAPSHOT-sources.jar  maven-archiver    test-classes
archive-tmp  generated-sources  mahout-core-0.5-SNAPSHOT-job.jar  mahout-core-0.5-SNAPSHOT-tests.jar    surefire-reports
[zhankunlin@IctHTC ~]$ ls mahout-svn/examples/target/
antrun       classes     generated-sources  mahout-examples-0.5-SNAPSHOT.jar      mahout-examples-0.5-SNAPSHOT-sources.jar  surefire-reports
archive-tmp  dependency  grouplens.jar      mahout-examples-0.5-SNAPSHOT-job.jar  maven-archiver                            test-classes
[zhankunlin@IctHTC ~]$

编译之前目录如下：
[zhankunlin@IctHTC mahout-svn-single-compile]$ ls core
pom.xml  src
[zhankunlin@IctHTC mahout-svn-single-compile]$ ls examples/
bin  build.xml  pom.xml  src

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附：

独立编译 core 和 examples或者其它项目

分别进入 core 和 examples 目录，
执行命令 /local/apache-maven-3.0.3/bin/mvn compile，/local/apache-maven-3.0.3/bin/mvn install，
这时maven将读取当前目录下的配置文件 pom.xml 进行编译，
(install过程应该包含了compile过程)