错误1.[root@MyDB01 hadoop]# ant -Dversion=1.2.1  examples错误: 找不到或无法加载主类 org.apache.tools.ant.launch.Launcher解决方案export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib:/usr/share/ant/lib/ant-launcher.jar错误2：BUILD FAILED/usr/local/hadoop/build.xml:634: Execute failed: java.io.IOException: Cannot run program "autoreconf" (in directory "/usr/local/hadoop/src/native"): error=2, 没有那个文件或目录安装包：[root@MyDB01 native]# yum -y install autoconf错误3：create-native-configure:     [exec] Can‘t exec "aclocal": 没有那个文件或目录 at /usr/share/autoconf/Autom4te/FileUtils.pm line 326.     [exec] autoreconf: failed to run aclocal: 没有那个文件或目录安装包：[root@MyDB01 hadoop]# yum -y install automake错误4：     [exec] configure.ac:48: error: possibly undefined macro: AC_PROG_LIBTOOL     [exec]       If this token and others are legitimate, please use m4_pattern_allow.     [exec]       See the Autoconf documentation.     [exec] autoreconf: /usr/bin/autoconf failed with exit status: 1安装包[root@MyDB01 hadoop]# yum -y intall  libtool