I already tried "yum install gcc-c++"
Result is this:
# yum install gcc-c++
Loaded plugins: enabled_repos_upload, fastestmirror, imgbased-persist, package_upload, product-id, search-disabled-repos, subscription-manager, vdsmupgrade
This system is not registered with an entitlement server. You can use subscription-manager to register.
Loading mirror speeds from cached hostfile
* ovirt-4.2-epel: mirror.seas.harvard.edu
No package gcc-c++ available.
Are you on ovirt-node? If yes you'll need to enable centos repos from /etc/yum.repos.d/
Error: Nothing to do
Uploading Enabled Repositories Report
Loaded plugins: fastestmirror, product-id, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Cannot upload enabled repos report, is this client registered?
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