GCC 似乎没有安装在我的 Rhel 6.1 机器上。另外，当我这样做时：
sudo yum install gcc
它吐槽：
Updating Red Hat repositories.
Setting up Install Process
No package gcc available.
Error: Nothing to do
相同的命令在 rhel 5.5 上运行良好。可能是什么问题呢？
更新：
sudo yum search gcc
回报：
libgcc.x86_64 : GCC version 4.4 shared support library
libgomp.x86_64 : GCC OpenMP v3.0 shared support library
sudo yum grouplist
回报：
Loaded plugins: product-id, subscription-manager
Updating Red Hat repositories.
Setting up Group Process
Error: No group data available for configured repositories
sudo yum install repolist
回报：
Loaded plugins: product-id, subscription-manager
Updating Red Hat repositories.
Setting up Install Process
No package repolist available.
Error: Nothing to do
更新 2：
sudo yum repolist
回报：
Loaded plugins: product-id, subscription-manager
Updating Red Hat repositories.
repolist: 0