Resolving Dependencies
--> Running transaction check
---> Package gcc-c++.i686 0:4.4.7-11.el6 will be installed
--> Processing Dependency: libstdc++-devel = 4.4.7-11.el6 for package: gcc-c++-4.4.7-11.el6.i686
--> Processing Dependency: gcc = 4.4.7-11.el6 for package: gcc-c++-4.4.7-11.el6.i686
--> Running transaction check
---> Package gcc-c++.i686 0:4.4.7-11.el6 will be installed
--> Processing Dependency: gcc = 4.4.7-11.el6 for package: gcc-c++-4.4.7-11.el6.i686
---> Package libstdc++-devel.i686 0:4.4.7-11.el6 will be installed
--> Finished Dependency Resolution
Error: Package: gcc-c++-4.4.7-11.el6.i686 (c6-media)
           Requires: gcc = 4.4.7-11.el6
           Installed: gcc-4.4.7-16.el6.i686 (@base)
               gcc = 4.4.4-15.el6
               gcc = 4.4.7-16.el6
           Available: gcc-4.4.7-11.el6.i686 (c6-media)
               gcc = 4.4.7-11.el6
               gcc = 4.4.4-15.el6
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

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解决办法：将 gcc，cpp, libgomp 等等依赖先删除掉，然后重新直接安装 gcc-c++,让其自动安装它的正确版本的依赖的 gcc, cpp, libgomp:

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[root@localhost ~]# yum install gcc-c++Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * c6-media:
Resolving Dependencies
--> Running transaction check
---> Package gcc-c++.i686 0:4.4.7-11.el6 will be installed
--> Processing Dependency: libstdc++-devel = 4.4.7-11.el6 for package: gcc-c++-4.4.7-11.el6.i686
--> Processing Dependency: gcc = 4.4.7-11.el6 for package: gcc-c++-4.4.7-11.el6.i686
--> Running transaction check
---> Package gcc.i686 0:4.4.7-11.el6 will be installed
--> Processing Dependency: libgomp = 4.4.7-11.el6 for package: gcc-4.4.7-11.el6.i686
--> Processing Dependency: cpp = 4.4.7-11.el6 for package: gcc-4.4.7-11.el6.i686
--> Processing Dependency: libgomp.so.1 for package: gcc-4.4.7-11.el6.i686
---> Package libstdc++-devel.i686 0:4.4.7-11.el6 will be installed
--> Running transaction check
---> Package cpp.i686 0:4.4.7-11.el6 will be installed
---> Package libgomp.i686 0:4.4.7-11.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================================================================== Package                               Arch                       Version                            Repository                      Size
==========================================================================================================================================
Installing:
 gcc-c++                               i686                       4.4.7-11.el6                       c6-media                       4.3 M
Installing for dependencies:
 cpp                                   i686                       4.4.7-11.el6                       c6-media                       3.4 M
 gcc                                   i686                       4.4.7-11.el6                       c6-media                       8.2 M
 libgomp                               i686                       4.4.7-11.el6                       c6-media                       135 k
 libstdc++-devel                       i686                       4.4.7-11.el6                       c6-media                       1.6 M

Transaction Summary
==========================================================================================================================================
Install       5 Package(s)

Total download size: 18 M
Installed size: 43 M
Is this ok [y/N]: y
Downloading Packages:
------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                      21 MB/s |  18 MB     00:00Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : libstdc++-devel-4.4.7-11.el6.i686                                                                                      1/5
  Installing : cpp-4.4.7-11.el6.i686                                                                                                  2/5
  Installing : libgomp-4.4.7-11.el6.i686                                                                                              3/5
  Installing : gcc-4.4.7-11.el6.i686                                                                                                  4/5
  Installing : gcc-c++-4.4.7-11.el6.i686                                                                                              5/5Unable to connect to dbus
  Verifying  : gcc-c++-4.4.7-11.el6.i686                                                                                              1/5
  Verifying  : libgomp-4.4.7-11.el6.i686                                                                                              2/5
  Verifying  : gcc-4.4.7-11.el6.i686                                                                                                  3/5
  Verifying  : libstdc++-devel-4.4.7-11.el6.i686                                                                                      4/5
  Verifying  : cpp-4.4.7-11.el6.i686                                                                                                  5/5Installed:
  gcc-c++.i686 0:4.4.7-11.el6

Dependency Installed:
  cpp.i686 0:4.4.7-11.el6       gcc.i686 0:4.4.7-11.el6       libgomp.i686 0:4.4.7-11.el6       libstdc++-devel.i686 0:4.4.7-11.el6

Complete!
[root@localhost ~]#

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可以看到安装 gcc-c++ 成功了。