hadoop2.4 'protoc --version' did not return a version

您好，我按照您说的从零教你如何获取hadoop2.4源码操作，最后出现了[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.hadoop:hadoop-maven-plugins:2.4.0:prot
oc (compile-protoc) on project hadoop-common: org.apache.maven.plugin.MojoExecut
ionException: 'protoc --version' did not return a version -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionE
xception
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command

[ERROR]   mvn <goals> -rf :hadoop-common错误，是怎么回事啊

protoc 配置正确就没有问题了,具体可以参考：
目标只要出现

protoc --version
libprotoc 2.5.0
复制代码

就代表安装成功了

win7如何安装maven、安装protoc