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linux centos 装g++安装不了

今天需要编译一个项目的时候在装g++都装不上,

[root@master hadoop]# yum install g++Loaded plugins: fastestmirror, refresh-packagekit, securityLoading mirror speeds from cached hostfile * base: mirrors.yun-idc.com * extras: mirrors.yun-idc.com * updates: mirrors.yun-idc.comSetting up Install ProcessNo package g++ available.

 一直提示这个错误,后面参考网上资料用: yum install gcc-c++就可以,如下图

[root@master hadoop]# yum install gcc-c++Loaded plugins: fastestmirror, refresh-packagekit, securityLoading mirror speeds from cached hostfile * base: mirrors.yun-idc.com * extras: mirrors.yun-idc.com * updates: mirrors.yun-idc.comSetting up Install ProcessResolving Dependencies--> Running transaction check---> Package gcc-c++.x86_64 0:4.4.7-4.el6 will be installed--> Processing Dependency: libstdc++-devel = 4.4.7-4.el6 for package: gcc-c++-4.4.7-4.el6.x86_64--> Running transaction check---> Package libstdc++-devel.x86_64 0:4.4.7-4.el6 will be installed--> Finished Dependency ResolutionDependencies Resolved

 至于是什么原因就不清楚